One problem the X-Men movies and the Avengers film are not in the same continuity becuase Fox has the film rights to X-Men.
That's a pretty big problem! Looks like Carol is safe. Still, it could be 10 years before they make X-men 4, who knows how the land will lie by then...
Where does that leave Quicksilver and the Scarlet Witch then? And by association, the Vision!