i think he'll be a huge part of a supp company's program for years to come.
As long as he doesn't devalue himself by guest posing in terrible shape like another former champ, he should still be able to make good $ for a decade signing autographs, giving advices, and showing up at expos. Even if he retires, he's still a big draw.
I think he'll stay big and fit enough to look solid in a company polo shirt.