Is Disney/Marvel considering an outright sale of the X-Men to Fox?
For those of you who love conspiracy theories.
As a result of the terrigen mists and the retcons concerning Quicksilver and the Scarlet Witch, the Avengers have only one mutant, Rogue.
AvX destroyed relations between the X-Men and Avengers. Now with Quicksilver and the Scarlet Witch revealed not to be mutants and the Avengers practically having no mutants, the separation of the X-Men from the rest of Marvel is almost complete. If Disney/Marvel doesn't want to fully utilize the X-Men (make cartoons, more video games, more promotions) because Fox holds live action rights (film and tv) then what long term value does the X-Men hold for Disney/Marvel? I think they may sell them to Fox.
They now have the Inhumans for a large number of superpowered people so they don't have to have unique origins for everyone. Mutants fulfilled that roll in Marvel, but now that is out.
The cosmic characters would likely be available for use for both companies. The celestials, Galacticus, Roma and Merlin, etc have a place in both Fox properties (X-Men, FF) and Avengers. The X-Men have their own magical characters (Magik, Belasco, Margali, Amanda Sefton) in addition to those both companies could claim rights to (Roma, Merlin).
For the record I do like Extraordinary X-Men, Uncanny X-Men, and All New X-Men but this just confirms the complete separation of the X-Men from the rest of Marvel for me and it is clear the film rights are responsible. And Fox is never giving that up.