As has been said before, he's 26, he's got more money than most of us can imagine, he's got a beautiful wife and a brand new baby, and he's already achieved his place in Motorcycling history.
Yeah, sure, if he was addicted to the fame and playboy lifestyle like some other racers out there (Bear, for instance.....) he could go on to winning more MotoGP world championships, but unlike many of his predecessors, he's still intact physically, and still has his health.
The rumour is that he's swapping two wheels for four and we'll see him next year in the Aussie V8 Supercar series. Not anywhere near the same money or international stardom, but if that's what he wants to do, then more power to him. Cheers, Terry.