It's just not going to happen.....
I really don't think it's out of the question at this point. The DVD of Serenity is now profitable for Universal - who has the rights to 2 more films - and they'd be crazy not to make another one now that the franchise has gotten as big as it has. The Firefly DVD box set turned a lot of people onto the show and I think the movie turned even more onto the show. Pretty much everyone I know that's a fan has been converted in the last, what 7-8 months since the movie came out? i didn't go see Serenity in the theaters, you didn't, Chris didn't really know what it was about I don't think, and all three of us would account for at least a dozen showings and two DVDs of a sequel. And that's just three of us. Multiply that by however many thousand new fans there are... and Universal has to know it.
No, I don't think seeing more of our favorite crew is out of the question. Odds are, yes, that it will be as a movie sequel before anything else, but maybe, just maybe, someone will get a clue and bring back our show.
*steps down off his soapbox*