Wonders/Black Panther makes sense in possibility. You have four empty simulator bays, that could be easily filled with new ATLAS models, with the attraction being those remotely controlled ships that will whisk you through Wakanda. The adjacent theater for Cranium Command would obviously be gutted and turned into an elaborate preshow. Exit out where you used to enter into Body Wars into a gift shop.
Then we encounter the contract. People keep insisting that Disney used a loophole to allow Guardians but I think that's BS. I am sure there were talks between Disney and Universal, and Disney was caught massively off-guard by BP's insane success. This movie will end up making more than The Last Jedi. This is something that Disney will definitely at least try to fight for. So I have to imagine the lawyers are meeting and seeing if anything could be hashed out.
The ultimate issue is that BP was in the Fantastic Four... which currently has a space in MSHI, though themed around Doctor Doom. However, poster aside, BP doesn't appear in Doctor Doom, and the attraction itself has been rumored to be on the chopping block for awhile. I'd have to think that some sort of bargain would have to take place between the two to gain the 'blessing' to move forward on a BP attraction in Epcot. And they could always say no.
But that doesn't mean the talks can't happen, or aren't happening.
What
So doesn't Guardians but here we are. At least Wakanda is a futuristic society developing new tech.