Paingiver: Gabe Newell...Linux saint? I don't think so.
Valve is not a charity. It is company build for profit. And now Gabe cornered by Windows 8, Apple Store, consoles and other things, look forward for alternative plans. And Linux is great base for his Steam box plans. He has no restrictions for license, have free tools etc...
Steam philosophy is the opposite of the Linux philosophy. In fact we can not compare them because one is a company seek profit one is a community-driven effort for an operating system for everyone to use however they want freely.
Steam coming to Linux for "not loving us Linux users of course" but to make profit.
If Gabe want to win the Linux community he should strip the DRM from Linux version, but keep the DRM in Windows version and simple packages for games. And of course we should launch games without need of Steam. Open sourcing the client while keeping the copyright will also benefit greatly. Releasing the Steam codes will cost them no harm. On the contrary they will benefit from the experienced Linux community for developing Steam even further in Linux platform. And if everything goes well Nvidia and ATI(AMD) join to improve their drivers and them the OpenGL and other tools. We can have a great platform for gamers. Without the chains of Window they can get gaming to point that has never seen. And also we can forget about the old games don't run on Windows 9 or 10 etc. In Linux you won't see that kind of problem.
Think about it, if it occurs would be great. But i see it as a %00000.1 possibility.