Well I don't think they need to play the last 3 rounds...go ahead and give Tiger the Claret Jug and everyone can get an early start back home. He just finished -6 for the first round....
I read that he is 3 for 3 in major championships when Jack announced his retirement (2000 US Open, 2000 PGA Championship, 2005 Masters so far), and the fact that he romped at St. Andrews the last time there I think that the payouts in Vegas for Tiger will be pretty low (he's no longshot).
Anything can happen in the next 3 rounds, but once Tiger get it started rolling he tends to steamroll through a tournament.