As such, it makes more sense to start fresh, whenever the X-Men finally join the greater Marvel Cinematic Universe. The MCU has a particular way of introducing new heroes, as the ranks of The Avengers were methodically filled out across the past decade of filmmaking. It doesn't make sense throwing an entire group of characters who have their own four movies of history. But that unfortunately means that the X-Men franchise as we know it will likely come to an end with either Dark Phoenix or The New Mutants.