Originally Posted by
fumei
Even having just rewatched all the xmen movies (feel for me) I'm not entirely sure what you mean, but I'll assume you mean in the sense that time is a solid/one single linear timeline. In that case, no, that's usually not how the nasuverse operates. Choices sprout off into their own timelines and branches (though not necessarily every little choice, I guess, who knows) but the universe doesn't allow an infinite selection of timelines to exist. Instead, what happens is that the ones who are closest to each other are grouped together to form a "trunk" (in the sense that all timelines are part of a "Tree of Time"), and then any new timelines will stem from the choices established in that trunk. Sort of like when they make a sequel to an RPG but but they base the canon choices of the first game on what most people picked, so even though your playthrough had entirely different choices, now when you play the second game you have to base it on the "collectively" selected choices.
Any other timelines that don't fit into this for various reasons (too divergent, or too stagnated) get removed entirely.