#2 Bray Wyatt interference
The best thing on Raw these days has to be Bray Wyatt's Firefly Fun House. There have been so many creative things to happen on the show and it is a great re-invention for Bray's slightly stale character.
With all of this, a return to the ring or at least a run in is likely to happen soon enough as he can't just do the Fun House forever. His character seems to be a heel who acts like a babyface to trick children, so when he first returns it could be to save a babyface being beaten down. When the crowd realized it's Bray they will go bananas and it would be a great return that people could remember for a while.
Whenever Bray returns it will be great, so if there is a concern that this PPV might not be the best, doing something like this would make the overall show better and it could definitely happen.