Good question!
To be honest, it depends on where things stand with Phase Four and how that interacts with the Fox/Disney deal. I could see Marvel Studios going with Doctor Doom in Phase Four, since Doom works equally well as an Avengers villain, a Fantastic Four villain, an X-Men villain, or a Spider-Man or Doctor Strange villain. (He’s sort of the universal adaptor of supervillainy.)
To be honest, Doom kind of does everything that Kang does with time travel and faked deaths and the like, but with a lot more flair, and I could see Marvel going with Doom out of a desire to show off that they could succeed with him where others had failed so often.
I did also see a tease from the Russo brothers that they might do a Secret Wars, which is a very simple way to get all of their new and old characters together and have them fight, and the Beyonder isn’t a bad pick for Big Bad as long as one stays away from his completely insane Secret Wars II incarnation:

We’’ll have to stay tuned, true believer.
