Gambit is more likely to be used In
1:Sequel to DOFP with remaining FC cast
2;Sequel to DOFP with OT cast
I think 2 Is more likely so they can pair rogue and Gambit together.They will likely fudge the age and have gambit's appearance In origins be one of things changed because of time travel In DOFP.
Best Marvel films-X2 X-Men Days of Future Past The Amazing Spider-Man X-Men Captain America The Winter Soldier The Wolverine X-Men first Class The Avengers Iron Man The Incredible Hulk
Best DC films-Superman Batman Returns Batman The Dark Knight Batman Begins Superman II The dark Knight Rises Superman Returns Watchmen