No one's going to invest any sort of serious money back into that show for two reasons... First, it's already flopped once. Second, the best part about it (Nathan Fillion) isn't leaving his big-time ABC show to come back to a previously-failed Sci-Fi show.
Actually, if you read the EW articles Jeff references above, the show pulled a 2.0 average rating, which is very passable in today's TV landscape. So the show actually had some legs. It's the movie that flopped.
And Nathan already said he would love to buy the rights to Firefly and resurrect it, even as an online series.
The real problem would be getting Whedon back on board. And probably Adam "Chuck" Baldwin. Morena could be available soon, as could Summer. (although I hope not as I love their current respective series)