#3 The Rock returns and teams up with Ronda Rousey
The WWE books WrestleMania in a way that is creatively and financially advantageous for them. There is a definite possibility that we could be seeing Ronda Rousey in a blockbuster feud with the commissioner of Monday Night Raw, Stephanie McMahon. The feud might be booked on the lines of Steve Austin-Vince McMahon in order to build mainstream attention around Stephanie McMahon and there's no denying that there could be an involvement from 'the Cerebral Assassin'.
The match could be set for WrestleMania 34, with Ronda teaming up with a surprise partner at 'the Grandest Stage of them All' against Triple H and Stephanie. The surprise partner could elevate curiosity among legions of WWE fans and a returning Rock will blow the roof off the place.
Imagine the level of mainstream media attention this match could get, while creating an iconic moment in the process.