As much as I would love to see the X-Men in MCU movies, I'd rather this deal not happen at all. Mergers of this scope are very difficult and take a lot of a company's energy and effort to make successful (not to mention capital). Frankly I think it was really the ABC/Capital Cities merger that ultimately sank Eisner. It took a lot of the focus and energy away from running the rest of the business. Pixar, Marvel, and Lucas were all different in that they were fairly self-contained, smaller acquisitions that complimented Disney well. This one just has so many angles that there's a lot of room for things to go wrong, and it will take a decade before it all settles out.