The one intriguing possibility I could think of would be Nashville. They have $6.6M in cap space available, so they could acquire him essentially entirely for futures. It's hard to say whether or not Nashville+Thornton would be better than San Jose is currently, but you could definitely make a case for that line-up being one of the top 2 or 3 contenders for the Cup.
You see, where Ray Bourque was a winner stuck on teams that couldn't go the distance, Joe Thornton is a loser who time and time again actively fails to carry his team when they need him to. So even if he pulls a Ray Bourque, the team that gets him will instantly regret it when he pulls a tin man in the playoffs.
Name one single team that can fit Thornton in AND is more of a contender than the Sharks currently are.
If the Sharks aren't in a playoff spot at the TDL, would they consider moving Thornton and or Marleau in a Vermette-style scenario?
Nashville
Nobody ever seems to mention that Bourque had two chances at the Cup in 1988 and 1990 with Boston.
Nashville
Not a cup favorite but id love to see joe on the red wings as a wings fan