Re: GL faster than DX
Well, a quick look at distrowatch.com points out a least one distro that features games linuX-gamers.
Specialist distros are common in Linux. just look at Clonezilla, SystemRescue or Parted Magic to name just a few. I don't think that Mark Shuttleworth would be fazed by a games only distro, he's sunk a lot into Canonical and presumably still has the wherewithal to keep it going. Anyway this is FLOSS software, you just can't take your ball home if you don't want to play. Someone else will usually pick up the project and run with it. See Mageia for example.
Linus might be relaxed about proprietary games coming to Linux but I'm not sure that he would be willing to introduce a binary blob into the kernel. I'm no developer but the politics of the GPL and devs relationship with the kernel would probably stop such a thing happening.
"...you'd need something that all different package managers could plug into, but that's actually a lot less hard than the DRM system itself."
An independant distro, running as live DVD would short-circuit all these problems, you would have an integrated system with known parameters such that software houses could port their stuff with confidence. After all the GPL does not forbid anyone charging for a distro, what it does do is ensure that all changes are given back to the community, that way if Valve were to develop their own live DVD we would all benefit, especially the other software houses. It's a real pity that Loki Games failed, a bit too early in the development of Linux for it to succeed I think.
Failing this I think the choice of Ubuntu is sensible. It's got a lot of brand recognition and distros such as Linux Mint are based on their work so getting to the biggest audience possible. I just hope that other distros get a look in as personally I can't get on with Gnome and prefer Mageia, but that won't stop me from giving Valve a try, and some of my very scarce cash if they provide something I want.