Following the historic deal in which Disney bought Fox, the X-Men will be eventually making their way over to the MCU.
For a long time, he was the main character of the X-Men movies, but the series has turned the focus on spin-off films in order to split the focus on new characters.
The wonky continuity of the X-verse could allow a new actor to step in or an entirely new version of the character could debut in the MCU.
However, that’s still likely a few years away and Fox isn’t going to sit on its hands waiting for a deal that might not even be approved.