I went from a windows 98 box straight to my current power mac G5. I'd certainly welcome the ability to play all those games that neither computer can/could handle (needless to say, the 98 box is collecting dust).
if I wasn't a gamer, I wouldn't care... but I've played most of the recent Mac games out there and have enjoyed 7 of them enough to keep installed (plus Lemmings, but it's not exactly recent). the unending aisles of games to waste my hardearned money on... *drools*
this is not a bad thing at all. the only negative effect I can see is for the companies porting Mac games, since $60 for a 5 year old game will be a tough sell when you can play the same game on the same computer for $30, and have been able to for years.
and of course, as arn mentioned, it provides that extra safety net for us, Apple's noble ambassadors, to point out to potential Switchers.
so woo hoo.