"John Cena is taking time off from WWE to film a reality television fitness project with FOX. But, make no mistake about it, this is no passion project. If Cena’s latest venture becomes a hit, is he doomed to leave WWE and go the way of The Rock?" Source Now my thoughts on this is that it is a possibly. He is older so he is naturally going to begin to weigh his options. I think he will begin to take more and more "time off" and eventually become like the Rock where he makes a yearly appearance just to jump ratings but I can't see this happening for at least another 3 years.