Cenas been the number ! babyface forever. Any kind of heel turn will get him over. I liken it to when Hogan turned heel, it was unthinkable but afterwards it made complete sense as it was the only thing left for him to do. I think Cena is at the same point in his career. As a face hes stale and a heel turn will happen. Mcmahons just drawing it out as long as he can because he prolly knows its the one/only card he has left to draw with the current roster