Hacking drivers from another OS is harder than writing an OpenGL gfx driver for an OSX guest virtual machine, and nobody has been able to achieve that (both because of lack of time and lack of real interest). As you noticed, Pascal drivers for Linux aren't open source, so the reverse engineering effort needed would be overwhelming.
But back to your words, "that's the end there?", I've realized I want to dump Apple completely. Apple has a new direction completely (and I mean completely) opposite to my computing and life interests. I'll try to get running in Linux all the software I need, and I hope to be able to move in a few months timeframe.