OS Independent Games?

Jakyll asks: "Why aren't there [more] games for the PC that come on a BOOTABLE CD-ROM? Use Linux and autodetect the hardware - it would make DirectX and Microsoft irrelevant. Boot the disk just like your PC was a Playstation or an XBox - what is the main reason this isn't happening?" A few publications have been released like this: Gentoo has done this for UT 2003 and America's Army (they have their own site but it appears to be broken at this time); and there are the ScummVM Live CD ISOs, out there. Does anyone know if the major game studios have plans on doing something similar, or if not, the reasons why they aren't?