No...I'm not. He can decide what he wants to do with his manga, and its not as if anything is set in stone right now either.
I have to agree and say this argument is kind of shallow. You can basically use this argument for any and all stories ever written. You can even apply this to real life history. "History is written by the victors." Some history books have people thought to be the Heroes, yet they themselves have done just as bad things if not worse. Any writer who writes can control how a story is written. It's kind of a jerk-ish argument if you ask me. Like getting into discussions about video games or consoles and that one guy keep saying "PCs are the best ever." Yeah, just because it is true, you don't need reminding of this fact every time you want to discuss a game.
The author decides what happens, but the bigger question is "Why and for what purpose?"
Any respectable writer does not just write something without purpose. Otherwise, they would not be a good writer. A story needs to have flow and causality. If you do this, then this must happen (Whether it has a great impact or a minor one, everything has a purpose). Of course, some writers use a cop-out and say "It was all a dream," but then this is why they call it a cop-out. It's not exactly a popular choice in writing.
With Kishimoto, we respect him as a writer. Even if we don't always like how he handles some things, we do respect him to say "Well, he might have a purpose later on" and most of the time it does pay off. Even if it might be much later in the story. We HOPE that all he has written about Sakura, Naruto, and Sasuke actually meaning to it. We don't want to see a 360 in the story where by some "cosmic coincidence", all the characters end up right back where they started personality wise. Development is the car. Conflict is the motor. With the characters being the key.
Sakura possibly still having feelings for Sasuke might be there, but I have a feeling it over between them. She was in love with the Sasuke in Part 1. Not the Sasuke now. Since he has changed so dramatically, I doubt she can keep these feelings especially after what he has done to her. We can also throw the "She will fall right back into love if he comes back" as when she saw him again, she wasn't too happy to see him. That alone gives a hint that him just coming back is not enough to change her mind. Not only that, but combined with the fact that whenever she needed someone she always looked to Naruto. Whether it be support or courage. He was always the one that guided her even if she didn't have the answers.
I know there are facts even before the Pein, but I think for me, the Pein arc was where I finally believe it was canon. When the whole village was crushed and when Sakura knew that someone needed to be the hero, she didn't look for Sasuke. She looked towards Naruto. She screamed for Naruto to come back and save them all because she knew only he could. If she still had feelings for Sasuke or some weird obsession with him, do you think she would have prayed for Naruto to return? I know some will say it something like "Well she knew Naruto was the most powerful" or something like that, but that one scene spoke so much to me personally that I even look at scene when I have doubt.
We saw how emotional she got when Sasuke left. We saw that she had an even bigger reaction when Naruto got hurt or when she thought he was going to die whether it be through the Akatsuki or because of Kurama taking over. I wonder how she would react when she actually thinks he dies. I wonder how broken she would be.
I wonder, what SS fans would do if at the battle between Naruto and Sasuke when they both hit the floor. Sakura runs over to Naruto and not Sasuke.