I don't think that Cena will ride out his career like Hogan, Sting and Flair. I could see him going down a similar road as HHH, but I think his full time days are numbered. Maybe 5-10 years. Maybe less if he decides to plant some seeds into Nikki Bella. Personally, I think dudes like Big Show, Kane, and Mark Henry are more likely to hang it up in the next couple of years.