I think Hossa has a lot of talent left in the tank, but unfortunately, no, just no. Hossa hasn't played a full 82 game season since Atlanta. We'd have to trade something significant for him and when he undoubtedly gets injured we're going to see more Tim Sestitos in the lineup. Too much risk involved. It may still be possible for old men to win an NBA championship, but that hasn't worked in hockey since 1967.
The Red Wings of the 2000s were some of the oldest teams ever put together, and did some serious damage; they won the Presidents' Trophy 4 times and the Cup twice. In fact, the two times the Wings won the the cup, they were the oldest team in the league.