It's hard because you think how it can be played?
obito wont access Naruto's memories and msot important Sakura is virtually immortal here, there's Tsunade and Hashirama who can heal her and plus Naruto can heal too and she's covered with the kyuubi chakra, plus the fact she has the seal who give her similar powers to Tsunade.
I stick with my belief, the only reasonable way to redeem Obito is Obi/Rin parallel happening but i doubt it will happen because it would make NS canon.
The parallel can be made after Sakura is wounded - he could make the connection easily by Naruto's reaction to it. As was already said, Obito is not likely to specifically target Sakura at this point - either she will get injured unintentionally, or she will get hurt trying to protect Naruto from Obito.
We already know that there are injuries unable to be cured by medical jutsu (otherwise Dan and Nawaki and Neji wouldn't have died). I don't believe that Katsuyu's healing fluid extends to where Naruto and Sasuke are, and I don't think that her abilities will prevent her from being grievously wounded (recall Tsunade got severed). Its very likely that the factors you mentioned will allow Sakura to survive any attack - which is perfectly fine. As I stated before, Sakura doesn't actually have to die, Naruto just has to believe that she is dead or that she might die.
I also don't see how you think the ObiRin parallel being confirmed will make NaruSaku canon. The confirmed MinaKushi parallel is a much stronger hint for canon because:
1. MinaKushi was actually a reciprocal romantic relationship, whereas ObiRin, as far as we know, was one sided; and
2. Kishimoto blatantly used the MinaKushi parallel as foreshadowing with Kushina's words in chapter 504 and Minato's comment in 631 - hinting pretty clearly to readers that Naruto is going to end up with a girl like his mother.
Again, the only thing that needs to be brought to Obito's attention to complete the parallel is Naruto's feelings for Sakura, which are already well established - we don't need Sakura's feelings for Naruto to come into play at all, especially since Rin never returned Obito's feelings (again, as far as we know).
Well, Naruto didn't have all that love and respect in the beginning and I believe people forget that. Naruto had to work very hard to get where he is today, but at the beginning was the village goofball, and looked unimpressive when he tried to act cool in the slightest. It was even joked he could never be the main character to a shounen manga. Really, what we are seeing now is the congrssion of all his hardwork and actions, truly becoming somwone that is necessary to the world as Gaara said in the latest chapter. Of course as you said, he still shows his flaws for humor effect mostly.
Bolded: That should definitely be in the manga though rephrased for dramatic effect. I could see Naruto saying something like that.
I'm glad you thought that my underlying message was in the ball park of what needs to be gotten across to Obito in the end 
I agree it needs rephrasing, haha
As to the first part, I think people forget because Naruto's hard work has been paying back since chapter 450 where the entire village acknowledged him as a hero (which was back in what, 2009?). The pacing in this arc has been pretty terrible, and there's been a lot of repetition here, so I'm not surprised that some people are getting tired of the Naruto wank among other things (because there are definitely some chapters that hammer in it pretty hard, 649 being one of them). I don't mind it so much personally, but I can understand some people are unhappy with it.
Well to be fair, Sakura only mentioned that the Sasuke's situation will be handled only by Naruto because everyone, including her, has no other decisions but kill him. That and don't have the connection with Sasuke. Naruto is the only one in the opposing side (to Sasuke) that can connects him. That said well I did get worried if she was going to be sidelined in general, rather when that time comes, but luckily, it will only be that case while still supports him all the way to the end. So that's reassuring. Plus, she still gets to do more stuff, rather watch and/or do an individual work.
I do believe that time will come soon about surpassing Tsunade, so it's getting there in a sense. As for her overcoming her feelings for Sasuke, well that is building it up, so either the answer is here or in the next phase/arc, which is most likely. As for her and Naruto, the main problem is the buildup has been made, so ignoring this would hurt the purpose of it. It's not very needed IF it didn't get that sense of buildup, but it is now. Other anime/manga could get away with it if they don't continue to emphasize the romance from the character's side of view. Honestly, that Yamato's comment actually left a seed that is more impossible to burn down than the God Tree. So now, it must be answered. I mean we have teases yet we can still leave them be, but what I mentioned is what really made this hard to pass up.
Exactly my point on the parallels. People would say, "You want the parallel to confirm to feed your NS ego." Actually, we are good enough with everything, even now, but the real point is that when something like this is addressed heavily, it must have a point on the amount of details we have. Is there a point to this? Is it for the sake of the plot? We don't know until the moment finally arrives and if it doesn't, then it's rather pointless. Yes, we understand Obito, but again, you got to address the purpose behind it. If it's in this volume, do it because well we got Sakura rolling with her screentime. Funny how Obito is distracted not to see Sakura being a medic, but maybe it's coincidence. Maybe.
I agree that Sakura can't reach Sasuke on an emotional level or match him in a physical fight and that only Naruto can at this point, but I didn't like the implication that the only thing she could contribute was to believe in them (much like you described fearing yourself).
I hope both of our hopes for Sakura surpassing Tsunade come to pass - its been heavily hinted that she will do so, and that her teammates have already surpassed their respective sannin parallels pretty much guarantees that Sakura will do so as well. As someone else already mentioned, I believe that Tsunade being on the battlefield should help Kishi to demonstrate this, just as the former Hokage were brought back to demonstrate how Naruto had surpassed them.
There definitely has been a lot of build up for Sakura to both overcome her feelings for Sasuke and to fall in love with Naruto, but just because we see it as the most logical outcome doesn't mean that it is guaranteed. Kishi can ultimately do whatever he wants, and there's always the possibility that we are misinterpreting his clues. I'm not saying its likely, but I think the possibility is still there unfortunately (even with an open ending that doesn't really resolve anyone's feelings - the manga he based his love triangle off of was never resolved either).
whoa, what? o__o I never heard this. Source?
I don't have a source, I just recall it being discussed on one of the forums I frequent. It could very well be false - I think I accepted it since the people discussing it didn't challenge it, just took it as fact.
Sakura death is an option, I'm not shutting it out. Especially considering Obito has the Rinne Tensei (No one can tell me that was not there for nothing ... even if it's not for Sakura). However, I don't think it's necessary for a complete ObiRin parallel. It could be done, but it'd be a little too much. We already got his Neji breakdown, didn't we? I don't mind a resurrection though, believe me I've seen worse stories that abused this tactic to the point every death has no sentimental meaning. *cough* Dragonball Z *cough*
I've envisioned a lot of scenarios for a while now, but I'm particularly favoring one. As all of us know, Sakura's been working nonstop to heal the wounded. Since the alliance arrived, she spent some time fighting with her new seal and now she's summoning 1/10 of Katsuyu with Tsunade. Unlike Tsunade or Naruto who have large chakra reserves/stamina to keep on going, Sakura doesn't have this advantage. In comparison to them, her chakra's rather small and that means she tires quicker. That means she'll be weakened some point soon due to her overexertion, making her an easy target. Due to her weakened state, she'll get attacked either by the Juubi (more likely) or Madara (less likely). I doubt Obito will be the one to land the blow, since he's busy talk no jutsuing Naruto (lol ironic). Sakura getting injured will probably be accidental, since none of their enemies have no real reason for her to specifically targeted. If it was because she was medic, Tsunade would be the prime option before her.
Personally, I picture Sakura getting fatally stabbed (doesn't have to be stabbed ... but that's just what I picture in my head lol), causing Naruto to believe she's dead and lead to Obito's redemption after his rising above it and saying something like "I'm not giving up because ... Sakura-chan wouldn't want me too!" If Obito monologues his own experience with Rin when he was younger, I can see Naruto bringing up Rin and saying she wouldn't of wanted him to become a monster. And in doing so, making the ObiRin/NaruSaku connection. This and only this would make Obito realize his weak will and finally find it in him to believe again.
As for Sakura, after some heart-stopping drama and angst, confirms she is alive because of her new seal. Basically, it's like when Tsunade got stabbed, but survived because she could heal herself with Byakugou. So not only do we find a way for Obito to be redeemed, we see Sakura's newfound resilience because of her new jutsu. 
However, because Sakura is weakened and not quite used to her new abilities, I can see her struggling to recover for a bit. Making it a lot more dramatic than what happened to Tsunade.
Sakura will obviously be a plot device in this scenario if Kishi does this option, similar to Hinata's near-death and confession. That does slightly bother me, but I still find it the most logical and best option we have. At least, in contrast to Hinata's experience, Sakura will get back up again and not be painted as a "damsel in distress" like she was in the Kage Summit. Better already, right? 
Yes, Sakura's dying temporarily is definitely an option, it's just not my preferred option. And yeah, DBZ is definitely the worst offender of making death cheap lol.
I like your reasoning as to why Sakura would be attack - it makes a lot of sense that her getting badly injured would be a combination of being overexerted and/or being attacked accidentally. Like Morgaine, I really like your version of what Naruto would say to Obito in such a scenario - that's exactly what I think he should say.
And yep, Sakura surviving due to her new seal is just another reason I don't want her to actaully die as opposed to Naruto just thinking she's dead. That would be a pretty awesome moment for Sakura to show that she tanked such a grevious injury due to her own achievements with the seal.
I wouldn't mind her being used a plot device in this instance, especially if Kishi uses the opportunity for Sakura to show off her new powers/resilency through her seal. It would be even better if Sakura got injured in the first place because she was saving someone else (I still think that it would be incredibly easy for KIshi to tie Sakura getting injured to Chiyo's words and have her throw herself in front of an attack to protect Naruto or someone else). This way, Sakura most certaily is not the damsel in distress.
Yesssssssss! I've been saying for a white, TnJ is about closing the difference between Naruto and his enemy, getting his enemy to see things in the way he does and that the difference between Obito and Naruto could ultimately be in the way that they love their respective love interest. Why else make it clear that Rin, a kunoichi chose her death in order to fulfill her duty as a ninja? Why else remind us so recently (relatively speaking), that Naruto respects, admires, and adore Sakura's strength as a ninja? Maybe we're completely off, but I do think that evidence indicates that that's where this story is going.
I will say, Sakura might look like she's dead, she might be temporarily killed, but not permanently so.
The bolded are all excellent points! I love reading your interpretations - they make me excited about the manga's possibilities again! 
Here's hoping that you're right about where the manga is headed.
