I think they owe this to us as hockey fans. After all the crap with the lockout, it would be inexcusable for them not to play in the Olympics. And I want another World Cup ASAP, too! We haven't had once since 2004!
They didn't even start this season because of their little crap (I'd like to use stronger, but gave that up for lent) negotiations, they can darn well stop a season long enough for the players to participate in the Olympics.