The problem with that theory though is it wasn't like that in Part I when he set up all these goals for Sakura. It has only been in part II where he has completely flip-flopped. And that goes beyond even just Sakura, but some other themes as well. But for Sakura specifically, he made a point in part I to show her craving the chance to stand beside Naruto and Sasuke, which sets up the prime opportunity for that to happen now in part II. But rather than doing that, he has Sakura settle with, 'I'll believe in them both!'. Why even bother with the 'I don't want to look at their backs' when he, in the end, decides that is quite alright for her to do so? It's like he ran out of time, wanted to do more for Sasuke and Naruto and Sakura basically got re-routed to fit his new direction. I have a hard time believing a lot of his story for part II was visualized when he was writing part I.
I think she was doing fine until those particular scenes. It seems that when Sakura was given a focus the second time around (first time being her fight) her character surprised a lot of fans. I thought she had already 'believed' in them, like when Hinata had called out for Naruto and Sakura told her to focus on the enemy instead. Sakura had been a strong character during her breif apperances in part two, even though she was not directly involved all the time she still had her scenes where she appered to present a strength in character. She unfortunately cannot stand by Naruto and Sasuke's side as an equal in fighting ability and skill, and that much she knows. If she came to the conclusion that Naruto better understands Sasuke, and is the only one capable of truly standing as an equal to him, perhaps she could have said something along the lines of "believing in Naruto" and "doing as much as she possibly can to help him", rather than just write herself off as doing nothing and just standing at the sidelines, cheerleading. She has grown stronger, even in those scenes so some of her goal has come true. Her character has built enough that she could admonish Sasuke and defend Naruto against him. She is closer to understanding them than she used to be, and all "I" can do is hope Kishimoto builds on her and not simply throw her away and leave her behind.
He has definitely changes his themes around, though, particularly with the destiny vs decision thing. In the beginning Naruto and Neji were fighting over fate and what birthright really meant. Now Naruto is a "child of prophecy", his brotherly/rival relationship with Sasuke "destined", and even his favourite colour orange being a product of his parents. Naruto was destined to be something great--so he wasn't a loser after all. How does this match up to what he was saying before in Part 1?