Canadacow could just go back to making it just a Windows driver and develop the DOSbox version in parallel without releasing it to the general public. That way he's not obligated to release any source code, and I get to actually use it with games 😉
Seriously though, if anyone really, truly wants canadacow to release the source, then just say "canadacow, please release the source". If you do that, then he's legally obligated to release his source for the DOSbox version of the emulator due to DOSbox's GPL license. But if you don't really, truly, honestly, sincerely intend to make use of the source at this point then please stop harassing him!
I do agree that releasing source code is a good thing though. If canadacow has to stop working on the emulator for some reason then someone else can come in and pick up where he left off - but only if they have something to work with.