As I already said here. I think Kishi is not happy with the ending. That's why we have so many contradictions! And since SP/SJ is all about the money. They'll be of the same opinion once the movie fails! Kishi can easily say The Last is not canon! Part 3 can be treated the same way, or just canceled! And then he only need rewrite the last two chapters. Which wouldn't be that hard. And he can do it in two weeks time.
But for this to happen the movie needs to fail at box office. Earn less money then what was invested in it. And earn less then RTN.
There are so many ways to fix this story, it isn't even funny.