I never liked the idea of Uncanny Avengers to begin with. It felt extremely forced after AvsX pretty much showed the two teams hating each other fighting without mercy and with extreme prejudice. The two teams should have cut out any and all communications with one another right their. As to the idea of an Avenger joining the X-men I find that unlikely. The X-men would just kick them out with their prejudice of someone working with the government and due to lack of an X-gene. To me the X-men are just as big hypocrites as the Avengers only difference the X-men are far worst with their claim of coexistence.
Valid point. That should be addressed and yet, isn't.
The x-men have never been about "defending the mutant race" at most they've been a superhero advocacy group. There motto should be something akin to "don't hate us, respect us". If there is any adherence to Xavier's philosophy, there should be non-mutant members in the X-men or having a non-X-men mutant advocacy group featuring non-mutants, because that would be the ultimate expression of Xavier's dream. The Uncanny Avengers should be a prime example of that, but I think there missing a prime opportunity to tell a true proper story. AvX was a terrible lead-in for the series and having everyone in the series act like children isn't helping out much.
AvX was a forced and nonsensical story-line. Once I was aware of a new book coming out titled Uncanny Avengers, I knew more illogical consequences were coming. X-Men Assemble is no where in the making -- why not? Oh yes, that's right. Movies. That's why.