Think of it this way people, John Cena will always haveb the main event no matter who wins the rumble, no matter if both titles get unified, no matter if TheRock, Undertaker, or Brock LEsnar returns at any point, Cena will always have the main event spot.
Despite what Triple H told CM Punk last year, and I quote: *ahem* "No one is bigger than the WWE." Despite Cena's been on the main event rampage since 2010. Getting the main event spot at TLC against Wade Barrett when there was a Tables match for the WWE title AND a 4-WAY TABLES, LADDERS, and CHAIRS MATCH for the WORLD HEAVYWEIGHT CHAMPIONSHIP.
There is no stopping Cena, especially if when he fucks his body up again and again.