I think Reigns is a year away...like Big E.
Those guys will be the next ones coming.
What I really want to see is Cena win the Title in an underhanded way, maybe with the Authority's help...becoming "Corporate Cena" in maybe the biggest Heel Turn since Hogan at Bash at the Beach. He'll go on a 3 month rampage, just destroying everyone, ala Super Cena like we all know he's portrayed now...all the way to WrestleMania, or hell Summer Slam.
It would give the WWE, and wrestling in general, a shot in the arm, and then guess what...have Bryan, over at a prime Attitude Era Stone Cold level, be the guy to end that finally brings his reign of terror to end and taking down the Authority in the process.
Who wouldn't be excited by that entire storyline?
Not only does it make Bryan the biggest star in the company in 15 years, it revitalizes John Cena's career in a way that we might actually care about the dude. He's not leaving like Stone Cold/Rock and the like did. He's a lifer. Gotta switch it up.