I think it all depends what happens the next several months... Will Sting sign a deal with the WWE?? How long it will be?? Will John Cena hold the title up till then?? Will CM Punk resign with the WWE next year??
so here my take Wrestlemania 30
John Cena vs CM Punk for the WWE title..
Undertaker vs Ryback.. with Undertaker winning
then Wrestlemania 31 will be
John Cena vs Undertaker with Taker winning and retiring..