Originally Posted by Infinity9999x
As of The Wolverine, yes, everything that has happened, happened.
DOFP, however, is another matter entirely.
No it isn't. Even if they changed it, it is still there. Still on home video, still happened. Even if they play with the timeline, like in comics, what has happened has happened. Even if you make Jean a man, she was still a female in X2.
The only way you can alter a timeline, is by having a timeline in the first place. Just look at Back to the Future. It all still happened.