Why do some people think that the best for a footballer's career is just winning trophies?
There are lots of great players who haven't won valuable trophies in their careers, even though, they've achieved things which are much much bigger than money and trophies, their fans' respect before love.
Batistuta, he played for Fiorentina for 10 years without having an eye on winning trophies. He transfered to Roma after that, he is still a legend though in Florence. Totti is another example. Most of Real Madrid players haven't won one single trophy for 4 successive seasons, still they show commitment and respect to their team. Henry never asked Arsenal to leave, despite the fact that Arsenal haven't been the same team as the stunning one 3 years ago and aren't expected to challenge ManUtd, Chelsea and Liverpool for the next season EPL.
Even though, Buffon is a different case. He won a lot with Juve since he joined 6 years ago. The only season without a medal was season 2003/2004. Juve and only Juve were the one who made him Campioni Del Mondo, the best goalkeeper in the world and having millions of fans from around the world.
I reckon it isn't a big deal for Buffon to wait for just two seasons without trophies. I'm not saying that he'd be ungrateful if he decides to forsake us, he's free to choose his next destination. But Juventus are still Juventus, always bigger and forever greater.