I still get a laugh out of the pairings websites that show all the pairings that display them, yet its funny how there is always this sense of downplaying or censoring NaruSaku.
I find the notion that "more screentime and focus = more importance = more development and long running" is still highly brushed aside and its funny to me that some still treat NS like this. I mean thats the basic thing separating NS from the others.
SS has been shown on Sakura a lot and to a smaller degree Naruto for the aspects of how he feels to her, mainly the promise. But its always been on sorrow and negative lights, never really advancing anywhere.
NH has been shown mostly on Hinata, hardly anything in return from Naruto exists. Even then its gone unused and unaddressed for so long, its just too many plot points and opportunities have passed. If NH went canon, she would sadly have been reduced to a stock love fodder token character. Lets leave the aspects of her trying to become self confident behind.
NS though, I mean come on, there have been many scenes, many many from one of them and some of them apart from comical have focused on more serious sides like the 4 tails event, 457, the hug. Now with 631 too invoking Naruto's feelings remain unchanged towards her and the whole NS-MK similarities that tend to run parallel (due to the early interactions). What more is there? This is just all from the manga too.
I find it hard to even imagine SS going canon just spontaneously and having Sakura remain static in one of her biggest traits and never changing only cause she held out hope, not to mention how is Sasuke obliged to love her? He doesn't need love, rather the only case of love for his character has been the familial or brotherhood one. As simple friendship, Sasuke's character is more involved with a sense of belonging who is his new family (like Naruto), but this ship is prone to cracking now because since Sakura is starting to show signs of not trusting him, Sakura may finally start growing out of her old views towards him. NH as well, I'm sure we all know the arguments of how Sakura is showing a childish crush, isn't it kinda funny how Hinata has been the one dragging out the one person mentality? Sakura at least saw flaws with Sasuke and only gained better outlooks about Naruto, but has the one with Hinata really shifted all that much? NH just had the potential but its far too late now. Many times Sakura was used, HInata was also acceptable. But Kishi kept focusing on Naruto and Sakura interaction. Even giving us an answer to both Naruto still loving Sakura and even Sakura getting development from her land of iron events, her events from there led to the 630 speech. Hinata from pain still has nothing addressed aside from a simple short flashback nothing else, not even 615 was thought on by Naruto, only Hinata (for a chapter like 633, that one honestly felt like the biggest sense of filler cause after that we don't get any attention save for team 7). 615 was more Hinata centric if anything, its just if Naruto didn't turn there then what else is there for NH? Its has these problems to contend with right now: the focus goes away from NH for many chapters, sometimes 50+, the moments just seem out of place for the main flow or plot at hand, the opportunity to expand on these events is largely unaddressed or left unattended, many plot elements that need answering are missing for these moments and people expect them to just suddenly happen, the notion of parallels adding more emphasis on other story elements (like team 7 to the sannin, Naruto and Sasuke to Hashirama and Madara) there is nothing of notable relation of NH on anything towards anything else, least NS has a small connection to MK, Sakura is still the only girl compared canonically to Kushina, until anything else comes up Sakura=Kushina is uncontested, it doesn't matter how much people cry over it, Kushina's foreshadow was an obvious plot point, she said to find a girl like her, NOT GIRL LIKE MINATO, If no girl aside from Sakura=Kushina at any point forward, what are we honestly looking for then? Not to mention another issue with 631, he still confirmed that he practically likes Sakura. If he really considers Sakura his girlfriend then what else should we go on cause NH isn't getting much attention. Hinata had her time and was then given a short sequence of achieving a power Neji had for years and then became a pair of binoculars for Sakura. NH has too many issues past and present, I mean now look at the story, the ten tails final form has been revealed. This fight is about to end (possibly start another), Sakura isn't trusting Sasuke, obviously the final conflict of Naruto and Sasuke would also include Sakura interaction and yes she would feel highly concerned over losing Naruto (the land of iron reunion made this clear, she would be upset over the notion of losing either of them), there is just too much.
NS has all the stuff the others don't, development, growth, parallel support, it freaking started as a one sided relationship but now Sakura highly cares for Naruto, a lot. Haters can claim this stuff anyway on any site. Sakura cares a lot for Naruto and Naruto showing he still loves her, well ever since 631 came the notion of NS should at least stand as a high possiblity to others to even just consider, I mean Kushina's background and early interaction with Minato, Minato's input from 631, Sakura starting to not trust Sasuke, that should stand as reason enough that things are possibly swinging towards a NS ending. Naruto never said he was outright over Sakura or showed that didn't he? If he still views her the same way and Hinata no different, if he really considers Sakura his girlfriend (even as humor in front of his dad) why would kishi even need to write it like that? He could have put HInata there, saved the Kushina stuff till later, or even ignored it fully. But oh hey its a trolling thing right? NS is a red herring? Yeah NH and SS would look much worse by that statement, why build and focus so much on something only to have a convientnt "side development" take centerplace after everything? I'm honestly suprised fans who claimed NS dead after 469 never considered "well if its over, why isn't kishi actually focusing on the NH deal? Why didn't he at least give more notion? Why even a filler of Naruto claiming he still loves Sakura and nothing anime or manga wise in the space between 469 and 631 showing him as no longer caring for Sakura?" "Why put that stuff from 631 there?" "What about Sakura's development? Surely she has more than just Sasuke on her mind, she still focuses much more on Naruto than Sasuke given the "pure love of SS." All these claims really just hilariously fall back to the main point of Naruto's character, he never gives up we all expect him to succeed in his goals, yet when it comes to pairings we expect the opposite, him to give up on the girl he loved the longest time and just settle on another out of completely convenience without much regard to the story?
Yeah that makes perfect sense, he succeeds in everything save the love he originally sought in the first place.
Thats just stupid.
NS has all the elements laid out, kishi can bring it forward in many ways, Naruto's unchanged, Sakura is changing her view on Sasuke and she cares a lot for Naruto and her involvement with him isn't even close to done, it will end around the Naruto vs Sasuke fight before or after it during the finale. NS has had a lot of development, interaction, growth, parallelism support (this is a bonus), its only going to move forward, if a forehead moment comes up I know we won't be surprised. NS has been dynamic, they have been through the ups and downs, done selfless action for one another, been impacted and impacted by each other in both positive and negative ways, yet they always come out as the best of friends, they have the potential to become more than friends. Kishi can bring it all forward when the time is right, this stuff can occur anytime after the current fight. I find it great how during one chapter of pausing the fight (631) he still gave NS the attention to just build on what was able to be seen (save Sakura revealing she had a powerup that was mostly a surprise but it had been hinted a couple times in the story) yet NH still faded to the back and SS is cracking hard. 631 gave us our answer, Sakura is like Kushina and Naruto still views her the same way, if he likes the idea of her as his girlfriend then thats enough in my book. If people want a clearer answer then they shouldn't be surprised when Naruto reveals he still loves her. The manga and the anime even have shown he still didn't change his feelings for her. If he didn't change in 615 and remained Sakura loving in 631, thats a good indicator of where things can go (also considering this in line with Minatos statement of Sakura) 
NS has a lot to come forward, there's a lot of evidence for it and the plot really has more to support it. NS has been through a lot but its got a great amount of potential to be the canon pairing. A lot of evidence is pointing to NS and not the others, rather only adding more obstacles for them to overcome but its just getting harder for them. Naruto and Sakura isn't canon yet but a lot of stuff is hinting it can come, this is just plain clear manga evidence spread out over the majority of the story. If 631 a late chapter like that didn't leave enough of a mark, I don't know what will Naruto still loving Sakura and how Sakura is changing from Sasuke is another big thing too. NS can happen, Naruto loves Sakura still and Sakura at this point couldn't bear losing Naruto. Its just got a lot of poential Sakura could look at Naruto in a new way soon. Its not insane, its just character development yet people will call it instanity or kishi being a bad writier. NaruSaku has a lot of evidence and potential, it can all come forward at this point considering what 631 did, so many things towards MK can be connected too. Just the development is enough without the MK parallel. Naruto and Sakura are very close, its just character development for them to end up together. NS has it all, development, interaction, growth, ups and downs, impacts and impacted by each other etc. NS is just one part of the ending and theres a lot showing it at this point.