We all know that WWE is aiming towards young kids at the moment. Cena is their current money maker. There isn't any other superstar that sells merch. like Cena. Do they really think sales would hurt if Cena is a heel? Remember when Hogan turned heel and joined nWo? It was a huge moment in wrestling history. Hogan was a babyface forever and they rolled the dice. Would it really be that bad if Cena was a heel? It's not like WWE doesn't have other guys that can take his place (Morrison, Bryan, Kingston). I think it would be a good change of pace for WWE to pull the trigger.