My comments on this usually get so long that I lose my point, so I'll try breaking it down into pieces.
1. Sakura knew that Naruto really truly cared about her, but Sai made her realize that it goes far deeper than that.
2. Sakura blames herself for causing Naruto pain and proclaims that she will be the one to tell him about the Sauske death sentence. No one else is to speak to Naruto except her.
3. She formulates a plan while traveling to find Naruto. She wants to protect Naruto and no longer cause him any pain.
Plan A: Confess love to Naruto to try and get him to come back to the villiage and relieve him of the POAL. This is a long shot, because as the events of the conversation unfold Sakura was clearly anticipating Naruto's response. If that's the case, then why go to the trouble of confessing in the first place. She could have said a number of things to make Naruto hate her, so why go the route of confessing love? I still believe that this moment shows the actual state of Sakura's feelings at the time. Naruto had presented her with every rational argument for loving him. Sauske had presented every rational argument for not loving him. I think that this part was Sakura trying to push through and convince herself of her feelings for Naruto. However, love is not rational, and therefore her confession seemed forced. Really, all this means is that her character arc is not yet complete. It leaves room for the growth and final revelations that are still coming.
Plan B: This was initialized when Naruto refused to accept that Sakura had abandoned her feelings for Sauske (Naruto was right). The second part of her plan was to make Naruto hate her so that he wouldn't be as distraught if she suceeded in killing Sauske or if he killed her. As others have stated, this is very much like Sakura's version of the POAL. She is taking the burden on herself for the sake of Naruto's feelings. At this point, she thinks that the only way to save Sauske from the darkness is to kill him. She feels that it is her responsiblity because she had loved him.
4. Sakura is unable to go through with it, because of the memories of the old Sauske.
5. Naruto saves her anyway, as Sauske tries to kill her.
6. When Naruto and Sauske face off, she shouts out to Naruto.
7. When Sauske attacks Naruto verbally, Sakura defends him.
8. Naruto gives Sakura hope that he can suceed in redeeming Sauske and that Sauske can be redeemed.
If you look at from this perspective, all of these events turn out as net positives for the development of NaruSaku. However, Sakura's feelings have not come full circle yet. She needs to realize that the bench scene in the beginning of the story imprinted a false version of Sauske in her mind. In that moment, she felt he understood her innermost self. The problem was that it was Naruto all along. Naruto has slowly lifted this veil from her eyes throughout the manga. This is where her final development lies. I think this will only happen either just before or just after Naruto and Sauske face off for the final time. At the same time, Naruto must get it through his mind that Sakura could move on from Sauske and love him. I think that this will only happen once the redemption of Sauske is complete and she can make that choice unimpeaded. I am convinced that we won't have any more confessions, as bad things tend to follow shortly thereafter. Each step in the maturation of Sakura's feelings for Naruto has been accompanied by an action: tender smile after being rescued from Gaara, the offer to feed him after fighting the Akatsuki, the embrace after the Pain fight, the warm smile after the latest confrontation with Sauske. Naruto may tell Sakura his feelings before his fight with Sauske in case he dies, but I doubt he'll let her react to them. When NaruSaku does become canon, it will be because Sakura has become enlightened to the fact that Naruto has always been the one she loved and because she takes action (just like Kurama said Naruto always proves himself through his actions).
Darn... I wasn't going to write much this time, but 45 minutes later...
Side note:
I agree that the intent of the fodder ninja moment was intended to show Sakura's regret for caring for such a bad guy. It was not elaborated on and left open ended, so the readers could draw their own conclusions. Very much a SS red herring.
Another side note:
I read the english translation of volume 64. I read 615. I read it again. Either my emotional reaction has subsided since first reading it, or the official translation has far less romantic inuendo than the unofficial translations. Instead, it read like the close of the Hyuga story arc for the manga.