In 2013 Andy Murray will win Wimbledon then retire. Hehehe joking.
He'd better not lol.
Seriously though, have we really seen any sign that Andy has lost the appetite? I don't think so, and I don't think winning Wimbledon would bring that about. If anything I could see it wetting his appetite for even more. It would certainly bring more support Andy's way in terms of the British public, who don't seem to get the USO win in the way they would Wimbledon.
Andy put himself in a position to win the AO, which is an achievement in itself. I still think it's amazing that no one in the open era has won their second major immediately after their first, and that Andy is the first to get to a final immediately after winning his first major. That tells me that if Andy can continue to put himself in a position to win again he will at some point. The way I see it is that Andy picked himself up after each of his four major final losses and put himself back on the line out there. If he can do it after losses like that, he can definitely do it after a wonderful win, two wonderful wins if you count the Olympics as well.
The funny thing about Wimbledon is that I think that if Andy can win it once he has the potential to win it a few times. I wouldn't like to predict it at such, but I could see him winning it two or three times if he can just get a first one. I can see him winning the USO again too, more than once, and I don't think the AO is beyond him, I really don't. The one that does concern me is the French, but we'll see.
I really wouldn't be surprised at all if Andy has five or six majors to his name by the time he stops. If he doesn't I will be more than content with what he has done, but I wouldn't be remotely surprised. He's fit, he's young, and he has plenty of time yet.