Fortunately, it looks like someone else may be able to pickup these Linux kernel, Graphics Execution Manager (GEM), DRI2 protocol, X Server, and DRI2 patches and run with them. Well, it's been proposed that this be part of the X.Org Google Summer of Code work, whereby Google would be paying a student developer to work on PRIME. Other Summer of Code projects for X.Org include Gallium3D H.264 and OpenGL 3.2 support, among other subjects.
David Airlie has agreed to be a mentor for this GPU offloading work for Albert Vilella, but they currently lack the supported NVIDIA laptops to continue on with this work. They are hoping ASUS or another company will step up and provide hardware sponsorship. It looks like this work will be sharing a project page with Hybrid Graphics Linux at Launchpad. Hopefully this project can move along.