No one actually expected Marvel Studios to strike a deal with Sony that allowed Spider-Man to shift between studios... until such a deal actually happened! Now Sony and Marvel are teaming up on Spider-Man: Homecoming, while the updated version of the classic hero was able to make his MCU debut in this summer's Captain America: Civil War. The point being, no deal is impossible, which makes today's news exciting -- albeit it, very tentative.
On an episode of Collider Heroes, Fatman on Batman podcast producer Matt Key weighed in on what he has heard regarding a possible partnership between rival studios Fox and Marvel. While nothing is set in stone, and a deal is still years away, at the very least, it sounds like a possibility, as Key said on the show:
What's probably happening is that Fox may be paying attention to the fan reception of this deal between Marvel and Sony, which has allowed Spider-Man to change studios (while also keeping a foothold in Sony), and they may be looking at their options. I don't think that Fox would ever give up its mutant properties. Even though X-Men: Apocalypse didn't make Days of Future Past money, it's still a hit, and a base that the studio can build on for New Mutant, X-Force and Wolverine stories. Where does that leave Fox? There are three deals I think the studio can make that would greatly benefit Marvel, and earn some brownie points from Fox in the eyes of comic-book movie fans, everywhere.
Release the Fantastic Four
Fox has taken two stabs at Marvel's first family, and neither has really connected. Tim Story delivered two Fantastic Four movies, but that was so long ago, current Captain America Chris Evans was actually the Human Torch. Now that Michael B. Jordan is moving on to Black Panther, I'd be very surprised to see Fantastic Four 2 happen, using the cast of the most recent reboot. Which means the team could transition over into the MCU in a similar way to how Spider-Man moved over.
Here's what you do. You pretend that the Fantastic Four has been part of the MCU already, just as Tony Stark (Robert Downey Jr.) was aware of the presence of Spider-Man. You introduce the new team in one of the Avengers: Infinity War movies, likely the first one, as the existing Marvel heroes are preparing for the arrival of Thanos. Then, the existing team is poised for a standalone film, like Homecoming, if Marvel audiences take to the new iteration. You don't need a third origin story. You just get a new FF.