Kitty saves the life of Senator Kelly, changing the present timeline and
splintering the future into two separate paths. Of course, X-Men employs the alternate realities philosophy when dealing with branching timelines, much like Dragonball or Bioshock. Going back in time to change the past doesn’t end up affecting anything in the future. Instead it creates a completely separate timeline in some other dimension. Our story will follow this new timeline, but characters and events from the Days of Future Past timeline will continuously bleed over, affecting things as if the true reality is continuously tugging at the present, as if the path of fate knows that it has been led astray and is seeking to correct itself. Does it even sound like I have any idea of what I’m talking about. (Uncanny X-Men #142 – Feb 1981)