This is going to be a tough year for WrestleMania. Rock's future with company is still very much in question and Undertaker's health is always in issue. In case neither returns what would you do? There is still Brock Lesner, but what can you do with him? He's already been thru John Cena, Triple H, and by the time WrestleMania rolls around he'll have gone thru Punk as well. John Cena has been thru most of everybody as well. Theoretically you can always have him & Bryan do a rematch on the big stage. Another possibility for Cena is Dean Ambrose. Although I really don't know if he would be ready to headline Mania by then but I guess if they build him right he could be.