Not sure why people are so confident that an X-men movie would be betterr served under Disney then handled through Fox. So far I have enjoyed X-men, X2, Wolverine Origins, X-men First Class and The Wolverine.
I am also happy with what Sony has done with the Spiderman franchise and am excited for Amazing Spiderman 2. If Marvel and Disney gets the rights to Spiderman and X-men we will see fewer superhero Marvel movie releases because they will have to multitask between all the other franchises and have less of a chance for creativity because it is one studio in full control of the franchise.
Ironman 3 did not leave me with the impression that Disney is perfect to handle every Marvel movie. Are people all mad because they want Spiderman and X-men to appear with the Avengers?