Roman Reigns and Dean Ambrose will meet in the finals with Roman Reigns turning on his former friend to win the World Heavyweight Championship and sell out in the process.
Or vice verse.
Both ways work honestly. And would keep things interesting until the reinforcements(Cena, Orton, Bryan, Rollins) come back.
I think Roman turning heel on Ambrose elevates both guys. Roman should be a heel and the fans will get behind him as one...and Ambrose will get closer to being the Stone Cold 2.0 character he was almost last year before the top brass forgot about him.
As far as all the "work" they put into turning Roman into a Babyface it's pretty much been for naught.
Make him a monster heel along he lines of Brock and watch him grow. Let him turn face in a year and it'll blow the roof off the building.