The thing is I doubt the Science channel has the budget or viewer count to be able to do it. Unless they have an executive who's an extreme fan then there's not really a chance of anything happening from them. But I don't know who owns the Science channel so maybe they can do something.
Joss had said at some point that it was possible to include Wash somehow if the story went on, I don't know what that would be like. In the comics so far they've setup that Zoe had gotten pregnant before he died, so at least he has a legacy to go on.
Interesting, I wonder how he would include Wash? I never read any of the Firefly comics, but I would be onboard if they continue the story. I just hope this doesn't turn into another fiasco of like the J. Michael Straczynski and the adventure of future of Babylon 5.