Thoughts on the Scarlet Witch

Fox and Marvel have stated that while they won't reach the point of officially "crossing over" their films anytime soon due to film rights, they do hope to be able to work together to try and make it seem like all the movies (avengers and xmen franchises) take place within the same larger universe. Which is confusing. How can you be in the same universe without crossing over? One possible answer might lie with the mutants Scarlet Witch and Quicksilver. Brother and sister, these mutants are the children of Magneto (though they didn't know it for a long time), and were tricked by him into becoming enemies of the X-Men early in their careers. Later, they left Magneto and reformed, joining the second team of Avengers. Legally, they belong to both X-Men and Avengers franchises, and Marvel has stated that in film, they could be used in either one, or even both. This would provide an opportunity to have a shared element between the franchises, but with X-Men going with "days of future past," they could introduce an alternate reality plot point or something else to keep the two franchises from being officially "crossed over." Many people think Scarlet Witch is the cellist mentioned in The Avengers as Coulson's girlfriend.