Originally Posted by Shikamaru
I personally wouldn't want X-Men to be integrated in the same continuity as the MCU movies or the FF movies. As many people have already said, there is no way mutants and mutant prejudice can work in the same universe as superheroes that are accepted by society. It's a flaw that even the comics have. If Spider-Man or the FF were the only non-mutant superhumans that existed in the Marvel universe, then maybe the general audience would buy it more that they would be accepted because they would be the big exceptions. But since the Marvel universe in the comics and the Marvel universe in the movies are all packed with superheroes, it wouldn't make much sense to why mutants would be persecuted.
I've read some arguments here from people on this thread about how mutants could fit in - one being that mutants are feared and persecuted because they're a whole new race while other superheroes are just humans with powers. That maybe would be a good explanation if most people working on X-Men made that the reason. However, if you look at the X-Men comics as well as the X-Men adaptations so far, the main reason according to most of the people that worked on X-Men to why mutants are feared is simply because they have powers. There are very few writers that addressed the mutant/superhuman double standard. Not to mention that the X-Men side of the universe usually tends to ignore the rest of the Marvel universe (and vice versa) when it comes to big events.
The Avengers have quite a few mutants on there team. Two of which I can gurantee will be in the Marvel films at some point. Scarlet Witch and Quicksilver. It will happen.
As for a big full crossover if they ever wanted to do it, It would have to come down to why the publics fear and other superheros prejudice to them would come in. If you placed all the X Men in that film UNiverse in one film you would need to adress that imo. Its happening in the comics right now when Captain America chooses Havok to be the team leader of a group comprised of Avengers and X Men. Marvel is going at great legnths to show that the X Men interact with the Marvel Universe as a whole. AvsX may have been a let down, but it introduced some interesting ideas and are showing that the intention is to have all these characters as part of the same universe. That will not stop it will only grow. There is nothing imo that would be wrong with interacting X Men characters with Avengers if the story called for it. People said introducing magic with Tony Starks technology only based films wouldnt work and that went fine. Gods and giant flying dragons are a bigger stretch then Mutants. Ive read these characters interact for many years. Going out of there way to force it and make money would be a huge mistake, but mutants can easily fit in the other Marvel films with the themes intact. If they wanted tons of X Men focus in a Marvel film then it would be a Civil War/AvsX type film, which is at the least decades off.