I never really believed in any of the past theory's for a Cena heel turn, but the fact that he is the only one who can bring the authority back in power makes me think that it could happen. Why have that stipulation if it wont be used?
If and when Cena puts the authority back in power, it would most certainly lead to a heel turn I think. Maybe it happens after he loses his next title match with Lesnar.
If Lesnar is going to face Bryan or Reigns at mania and Sting takes on Trips, where does that leave Cena?
Maybe a heel Cena, now a member of the authority, takes on someone like Ziggler who is mad that his hard work taking down the authority went to waste.
Probably wont happen, but who knows. What do you guys think will come about of this stipulation?