Not going to happen. NVidia and ATi have stated they couldn't open up the drivers if they wanted to. There's just too much licensed IP they don't have the rights to open.We don't have to wait for decent graphics drivers any more! Intel has open drivers!
Buy a desktop with integrated Intel graphics, slap in an "ADD2" card for DVI LCDs, and you have a fully open-source graphics system.
It works well for me - maybe not cutting edge video performance, but its not bad - way better than vesa or ati or nv open drivers.