For all that the Linux community tried, and god did we try, we didn't make real gaming on Linux progress until Valve started throwing developers are the projects. You can easily attribute real gaming (I love free civ as much as the next person, but it's not the same) coming to Linux Desktops.
Obviously kidding, Valve's efforts will IMO greatly expand Linux's target audience which is laudable. Seems to me that limitation was one of the main pullbacks for Linux adoption, especially in non-developer circles. Requiring dual-booting just for games on the Windows partition is not a convenient band-aid, and Stallman's solution never was one at all.
