Will John Cena ever turn heel?

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I think you could make a case for John Cena staying babyface for the rest of his career. I mean, he does bring in the children, who will beg their parents to buy merchandise. However, in a couple of years down the line, there might be a time where John Cena might need to turn heel. For instance for years, Hulk Hogan was what John Cena is right now(although to be fair, Hogan was much, much, bigger but Cena is in fact Hogan on a smaller scale). He was the popular hero but there came a time where even the children were growing tired of Hogan's tired routine. So came Bash at the Beach 1996 and Hogan becoming the third member of the newly formed NWO with Scott Hall and Kevin Nash and his career was revived. In fact, he might have been even more popular and known than ever before, because he was considered to be cool. Do you think if Cena turns heel, that might be the shot of the arm to catapult him to the next level like it did to Hulk Hogan fourteen yeas ago?