Calling it now: Goku and Jiren both get eliminated, Freeza is the last one standing, and Vegeta gets the wish, being the MVP of U7. I'm guessing he wishes for U6 to be returned, or possibly merged with U7.

Just as a shot in the friggin' dark, I'll also bet that something goes wonky with everyone's ki, and they stop being able to use godly energy. No particular reason for this one.