Buehrle only sniffs the Hall if he knocks on the door of 300 wins, which he isn't doing unless he pitches into his mid-forties. Granted, of anyone pitching right now, he has the best chance of being another Jamie Moyer given his durability, mechanics, and junkballing. I highly doubt Buehrle wants to pitch another 10 years, though.
He'll end up with around 230 wins, at least one WS ring, and a statue at the Cell. Pretty damn good for a guy that wasn't touted at all coming into the league.