Next big star of the WWE (and TNA)?

[Emperor Smeat]

Seeing as Cena is starting to get up there in age and recent debates on if Ryback's push will lead him to becoming a top star, who currently on the roster besides Ryback has a legit chance of becoming the next mega star of the WWE within the next 1-2 years?

By mega star I also mean someone who will easily be considered as the top guy for the next 4-5 years since by then Cena's reign probably would be over unless his really enters Hogan/Flair territory for length.

To a lesser extent, is Aires considered as TNA's next mega star or will it be someone else either currently on or not on TNA's roster at the moment?