As for whether the MCU should incorporate existing versions of the X-Men and Fantastic Four or use rebooted iterations, I vote the latter.
They say the third time’s the charm, so let’s introduce a new Fantastic Four that will finally receive the respect, attention and faithfulness this Marvel team deserves.
2019’s Avengers 4 will not only conclude the MCU’s Phase Three and lay the groundwork for Phase Four, it will also usher in a new beginning for this franchise.
The current X-Men franchise is starting to show its age, and after nearly two decades, maybe now is the time to put a fresh spin on this mythos.