Wine has a pretty good DirectX to OpenGL translation layer. It could be leveraged to provide this. Many games on Steam run quite well on top of Wine, and some of the OSX games available on Steam already use it.
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As someone who ran games under wine for years - yeah some do work well - some don't or with heavy speed penalty.
Ideally i would see openGL games on steam console - which shouldnt really be a tough problem since wii/ps3 do something pretty close to this.
It's interesting that you say some mac games use wine under steam - I wasn't aware of that.
Pretty much all Mac games at the moment are Cider (WINE) ports. Starcraft 2, Spore, NFS, pretty much any big game release is a Windows binary in a Mac wrapper. They're slower than native sure, but not awfully so.