10. John Cena
Whether you like it or not, the face that runs the place is going to have his return to the WWE rapidly accelerated now that Seth Rollins is gone, and it's hard to imagine that's going to involve battling for the United States Championship. Bringing John Cena back in any capacity is probably a big priority for Vince McMahon right now though, especially as the company needs a top star to fill the void left not only by the former WWE World Heavyweight Champion, but also Randy Orton. With ratings already slipping, they could fall even further without Rollins, so a record sixteenth title reign for the leader of the Cenation is a very real possibility. Seeing as Cena seemingly requested his well-earned time off (which he appears to be very much enjoying with his girlfriend Nikki Bella right now), the WWE has no choice but to offer him something huge which makes sacrificing his personal life worth doing the company such a massive favour. A WWE World Heavyweight Championship run fits the bill perfectly then, and you have to believe that Cena will be very glad to step back into such a prominent place in the main event scene after spending almost the entirety of 2015 putting over up and coming WWE Superstars like Neville and Sami Zayn as part of his United States Open Challenges.