Is it a dream? Is it a lie? I think I'll let you decide.
That's right--I'm currently installing Counter-Strike under Linux. Granted, my desktop computer is probably too slow for this to be really playable... but when I upgrade it in a year or two, I'll be set.
Of course, I'd much rather play native binaries. I'd love to work on creating a Linux-based console. I think open source software could provide a great platform for gaming. Aside from being free of restrictive NDAs that are typically associated with proprietary platforms, an open source platform would allow for complete control on the part of the game designer. Who knows if that will ever happen, though.