As it stands now, UPN is the most likely network to give Firefly a chance.
On average, Enterprise is pulling in about a 3.0 in the ratings and has dropped out of the top 100 several times this season. Despite having an established audience, and the fact that it airs on Wednesday nights, the show is performing far below the network’s expectations. In fact, Enterprise’s second-season ratings are comparable to those of Firefly before it was cancelled. Executive producer Rick Berman has already confessed that they are going to try spicing up the show with more sex and violence in order to attract viewers.
But now it looks like UPN may be waiting until the end of the season before they officially do or say anything about the future of Enterprise. In other words, they are not standing behind the show, nor are they guaranteeing that it will be around for next season.
Unfortunately for UPN, Enterprise is an expensive little show to produce. First – lots of aliens mean lots of latex and make-up. Second – because fanboys demand eye-candy, the show also has an overabundance of special effects. And the way the actors interact with so many of the special effects (phaser battles, computer data screens, CGI creatures, etc.) means that a lot of the special effects have to be joined with the live-action in post-production. Joss has cleverly worked around those problems on Firefly by using slug-thrower weapons and very little make-up. I’ve seen very few composite shots where actors interact with CGI effects. The shots are either completely CGI, or require no post-production special effects. Simple. Effective. Cheap.
My speculation is that if Buffy is gone next year, and Enterprise is already in trouble, UPN may be the most likely candidate to scoop up Firefly – if for no other reason than to have something to show next season... assuming UPN is willing to take a chance on a decent, semi-established show like Firefly.