I would LOOOOOVE the Brood Saga on the bigscreen! It's kinda a possible thing, given the Carol Danvers connection. The MCU has really been enjoying outer space themes. It could happen.
Other than that, my wishlist for MCU Ororo:
Rain goddess origin.
Expansion of her mother's culture, their connections to magic/divinity.
It would be interesting to see them approach how she was orphaned(a plane flying into a building, collapsing it) in this post 9/11 world.
If they do her Cairo part, I want to see EXCELLENT street thief Ororo, not that mess in Apocalypse. I'm talking Tomb Raider level acrobatics, coming down ropes from the ceiling, opening safes with her toes, picking locks with her tongue(I would love to see that vs. Magneto under the volcano story), kind of stuff!
Yes, the vs. Doom/RogueStorm thing!!
The Morlocks and vs. Callisto story done right.
vs. Cyke for leadership of the team in the Danger Room.
The whole depowered/Life Death/Fall of the Mutants story.
The original Genosha story+ X-Tinction Agenda story.
Any sampling from the X-Treme/XSE era.
That's it.