If Marvel gets the rights back to FF...

[Travelhc]

It would be cool if they made an appearance in the Avengers Infinity War Part 2, even before a reboot film. Sort of how Spiderman will be introduced to MCU in Civil War and then have a stand alone MCU film. There would be enough time to include them by 2019 if they can cut a deal like Sony did or if Fox lets the rights revert back like Daredevil.