Not sure that's a good idea will just fragment the game players even more, you want the widest audience possible. I know many people not even thinking about upgrading until the first service pack comes out for Vista, just because so much stuff still doesn't work right when upgrading. If you buy a new system more power to ya, but upgrading is still has alot of driver issues.
We'll see I don't see there being alot of interest in different types of servers to join. That just seems silly.