There was a rumour a while back that Disney/Marvel had agreed to changes on the island, but with the removal of any existence of XMen and F4. Probably nonsense, but with an Avengers ride possibly seeing the removal of Doom, this could have started the process if it were true.
Edit: Just to add, I find the overall theme of MSHI too messy and not very immersive, especially now the bar has been raised with Potter. My personal belief is that it would be better for this area to be more focussed on, say the Avengers, and become Avengers Island...narrow the theme, enhance the fascades, an immersive dining option etc. Blue skying here, but it's my personal hope for this Island, which IMO should be the highlight of the park but falls a little short.