I think that the only club, that can afford Gigi is Man Utd (as Real, Barca and Chelsea have their strong goalies, teams like Arsenal do not have that kind of money and cant bring Gigi any trofies, teams like Man City are a joke and Buffon already said that) and even if Buffon and his agent and everyone at the club said many times he is not for sale and will stay at the club for sure and etc, if a real offer from Old Traford comes, I am sure that Marotta will "evaluate all offers" (or whateva he said) and will try to cash in on Gigi. I hope this wont happen and Buffon will return to his best form, stay with us for the end of his career.
One thing that worries me, the situation with Marchetti and Cagliari, he is out of the team and I dont know what will happen, is there any chance he`ll cancel his contract with Cagliari and leave the club. If something like this happen, and there is a possibility to cash in on Buffon, I think Marotta would consider a cheap option like Marchetti to replace Gigi.