If we being honest...... Marvel don’t need to do anything special or extra to introduce the Xmen as MUTANTS been around for a minute in the MCU
Or as the Nazis liked to call them
“Miracles”
:hulkmouse:
Martha
people want The MCU's version of The X-MEN soon as possible but if I'm Feige/Disney I keep them in my back pocket and let the current MCU's run it course with out The X-MEN the next decade
and then introduce The X-MEN and every other messing major marvel character (think blade, Inhuman's, Namor, etc. ) seamlessly along with the hole rebooted/recasted MCU we have now (think new Stark,Cap,Thor, etc.) calling it something like "The Full Marvel Universe"
it would be a great way to keep the excitement up for the next Marvel movie Universe when Disney's inevitably reboot happens it wold also help fan's eases the pain of replacing Robert Rowney Jr., The Chris's, Sam Jack, Scarjo,Tom Holland etc.
you would all so get to see deep seated history and character interactions like imagine a Captain America world war 2 movie with Saving Private Ryan/ Dunkirk quality and detail with Cap and Logan/wolverine on a mission, or Cap and The Invader's/Namor , a flashback of T' Challa knowing Ororo Munroe before she was a X-Men and he was a king & black panther etc.