‘Timofonic’ spotted this post by an NVIDIA employee describing the changes needed for better performance/support of NVIDIA chipsets in FreeBSD. This could apply to DragonFly., though I daresay these issues would already be fixed (or at least worked on) if it wasn’t a closed-source driver.
Of course, while I’m at it, I may as well wish for a pony and a million bucks, as there’s probably business reasons for the closed-source driver that are more compelling than the opinion of Some Guy with Blogging Software Installed.