Given that Logan is the third Wolverine spinoff, it was obvious from the start that the entire X-Men team wasn’t going to be involved in the movie.
On the other hand, those of you who have read the Old Man Logan comic book story know that the mutant superheroes experienced a horrible fate (no spoilers here), so perhaps something similar has happened in the movie universe.
However, the trailers have indicated that the team isn’t even around anymore, and sure enough, it’s been confirmed that they disbanded sometime after X-Men: Days of Future Past.
The synopsis doesn’t provide a reason for why they’re no longer together, but it’s possible it may have to do with the shrinking mutant population across the world.