text: Personally, I believe alot of the face wrestlers get tired of being faces, he might be getting bored with his character. I wouldn't blame him, his face character isn't that appealing to today's crowd except to youth and teenage girls (mostly), because wrestling fans today don't want the boy scout face character nowadays like they did before with people like Hulk Hogan, fans nowadays are more realistic and like their face wrestlers to have more attitude than that, that is why The Rock and Stone Cold Steve Austin were so popular.  I am not a fan of John Cena, but I think that his wrestling character was the best when he was a heel or when he wasn't the top face. It is very possible that he doesn't like being the top face in the WWE, I mean it is alot of pressure to put on someone and alot of the past people who have had that spot have suffered either physically or emotionally because of it. I would like to see him turn face again. In fact, I know how it should happen. I think Randy Orton should win the Royal Rumble, face John Cena at Wrestlemania 23 for the WWE Title, and during it John gets frustrated that he is not able to beat Randy so he does stuff that makes him turn heel. Eventually Randy Orton would win the match and it would not only start a rivalry (which I think could become the next Austin-vs.-Rock), but also effectively have them switch places to where Randy is a face and John is a heel. I hope that answers your question.