I won’t say “never happen” but put me squarely in the “doubtful” camp.
I have a very good friend who is one of the main driver developers for a very large graphics chip vendor (who could that be?)
He has told me on not one, not two, but on dozens of occasions (and always not in response to a question but on his own) that his company would NEVER do this as there is too much secret sauce rolled up into their proprietary drivers. Basically if you understood their proprietary drivers you would understand way more about how their devices work than the company would want you to understand.
Your friend works for nVidia.
But the issue is not so much opening up a current driver as it is even allowing an open source one to be developed.
Like AMD. They’ll never open Catalyst. That hasn’t stopped them from creating and helping the creation of the open source Gallium3d drivers.
AMD has in a sense outsourced their driver development. In the long run, it could save them millions. They have several companies and individuals doing the hard work for them and to my knowledge, not getting paid for it.
They could theoretically, even realistically some point way down the road only support their newest line of cards for a very short period of time, then let the community support itself after that because the driver is open.