#3. Dean Ambrose gets added to Reigns versus McIntyre
This one if a little out there for sure but hear me out. This depends on whether Ambrose is actually leaving the WWE or not.
To start off, Roman Reigns isn't the only one who has heat with Drew McIntyre. So does Dean Ambrose. McIntyre has swatted Ambrose away every time they've gone one on one recently and it happened again last week on RAW.
This could be a way for WWE to add Dean Ambrose to the match at WrestleMania, seeing that Ambrose hasn't been booked for a match yet. This would be the perfect setup for Dean Ambrose to turn on Roman Reigns at WrestleMania. If Dean Ambrose isn't actually set to leave the WWE, Reigns versus Ambrose is one of the biggest feuds WWE could to post-WrestleMania and it would also give the feud time to build.