I think most people are ignoring the actual point of this conversation because let's face it the ultimate fact is the entire manga and whatever Kishimoto says is canon is canon, as much as we all hate it we have to accept it.
No the real point is what we all want to be canon and there is a lot we want to be canon and a lot we don't want to be canon unfortunately the facts are the facts and that's that. But as many smart people have been pointing out it is possible for Kishimoto to come back and change a lot of what he did because it was ultimately his manga and he can do that.
What I think most people don't realize is that there are several gaping a plot holes throughout the actual cannon that Kishimoto can come back and take advantage of later. For example the prophecy (no not that prophecy, the other prophecy) about how when Naruto and Sasuke fight they're going to die!
Yes you could go and say "Well it's a metaphorical death." And you may be right. I personally have a hard time believing that considering the severity of the tone in which the toad and Naruto were speaking when they brought up this very topic.
If you don't like accepting Naruto canon, fine, you don't have to like or accept the Naruto canon. But if you wanna do something about it and not be a complainer there's only one thing you can do.
Become a Fanfiction writer!
That's all you have to do and honestly that's all you can do because the sad fact is it's basically impossible for any of us, the masses, to change anything in the current cannon. No don't take this wrong, it's not necessarily a bad thing. There's this one Harry Potter fan fiction that so popular it's even got its own wiki page on the Harry Potter wiki. Rather than focusing on what we can't change let us focus on what we can change, instead of focusing on Canon pointlessly let us focus on what it is to write a good story even if it isn't canon. Because ultimately that's all we can do. That's all we'll ever be able to do and we just have to accept that, no matter how much we hate it.