I'm glad you're excited about fallback mode. I'd be nice if you could work upstream instead of posting to LWN comments though. You obviously have a lot of energy and some coding ability. The future of fallback mode is somewhat up in the air, especially if - as seems likely - in the next 6 month cycle Mesa improvements allow us to run full GNOME 3 perhaps with nontrivial but also not insurmountable experience degredation. That gives multiple interested parties an opportunity to step in and own the fallback code there.
However, we'd clearly like fallback to continue tracking GNOME 3 as a reference point, so that constraint would exist. Thanks!