I don't want Gambit in Apocalypse because it looks like they're going down the whole teen X-men route. Isn't Tatum pushing 40 or something? If Gambit is in a team movie he needs to be the sexy one flirting with all the ladies, and if those ladies are teenagers then...well that's bad. I don't want him to be the old man of movie. Unless they somehow go forward in time, like progress several years in the middle of the film and the characters are then older, bringing it into the current time. But that seems unlikely.
Although saying that, they are going to have to bring the timeline up to date, aren't they? They can't have the X-Men stuck in the 80's forever.