Honestly, I would not want Kevin Feige to get his hands on the X-Men. There's so many characters to explore for X-Men, adding them to the MCU is gonna make it feel very stuffed. I'm sure everyone wants to see a Wolverine/Hulk showdown. I want to see a Cyclops vs Mr Sinister showdown even more.
Not really having a strong a opinion on Feige one way or the other, part of my love for X-men is the giant nature of their universe. I honestly cannot comment on main Avengers characters, Spider-man's universe, nor DCs. To me, even though there are kind of the two main people (ProfX and Magneto), so many other characters were almost as important. If not more so at times. Apocalypse carved out a third perspective IMO that is different from Magneto. As much as I originally thought he was just the omnipotent bad guy, his back story seems to have provided motivation for his views now.
What I'm also saying is the X-men "universe" characters already live among the Avengers characters, right? So what is to say cameos here and there, or easter eggs is a bad thing? Oh shoot, that was Shatterstar in the background looking at Ironman! Or something that was in X2 if I remember when Lady Deathstrike was looking at file names of 2nd tier mutants. I still remember the first thing I said after X-men in 2000- the sky is the limit for this franchise if they do this right. I was so excited for the potential of all these characters. Luckily, they were able to retcon and refresh from the mis-steps of X3 and Origins.
The unfortunate thing for your view Accel is from what I follow with the Mouse, Disney/Iger probably wants to get X-men, and milk the fock out of it. They already are with the MCA, Pixar sequels, and are starting with Star Wars. Indiana Jones is having a fifth movie. The theme parks are whole other diamond mine, but obviously have merchandise tie ins. What is a factor here for 20th Century Fox- Disney owns Marvel merchandise. Go into a toy department, and let me know if you see anything for X-men. When I looked for Days Of Future Past, I saw nothing. From what I read, Fox cannot merchandise anything.
On the downside for Disney, ESPN is now creating a hole in their warchest, and last I knew ABC was number 2 or 3 in the big four broadcast networks. ESPN however, and maybe even broadcast TV is a symptom of the times, and shift in media consumption and interests. Comcast/NBC/Universal is the biggest media conglomerate still?, with I think Disney #2. However, the Mouse is printing $100,000.00 Woodrow Wilson notes with the MCA and SW. X-men would just be another explosion for them.
I will agree on Mr. Sinister! I think with Apocalypse comes him, so hopefully in the next couple of films.