Call me crazy, but I think Shinsuke Nakamura just might beat Seth Rollins and become Champion.
Considering the story, it would make sense for Seth to lose due to his back injury. If he actually needs time off take it. Then wonder if he can come back and make a heroic return yada yada. A heel champion makes a bit more sense on Raw atm, because outside of the Judgment Day there really aren't a ton of heels. Only Gunther, who is likely not going for the world title any time soon, and should win once he does.
Gonna make another prediction and say that Damien Priest will cash in the MITB briefcase in the near future............ .on Sami Zayn and KO. Don't think they're going to break up the judgment day just yet, and this is a way to resolve the issues therein. Also may just make the tag titles seem like they're worth something. Meanwhile, Sami and KO can go on to do stuff as singles competitors, which would make more sense. Maybe Sami Zayn vs Nakamura?