Screw the fans. Neither set would make a dent in the box office by staying away, which is not going to happen unless the general buzz around the movie is all kinds of negative. Disappointing the critics who are familiar with RDM's show might be a concern, though, and that can be addressed by having depth and high standards of production and performance. They'll probably also want to make the movie family-friendly in direct proportion to its budget. All things considered, maybe BSG should once again draw from the well of Star Wars (1977).
Having said that, I think I'd like to see the antithesis of NuBSG; a movie to which NuBSG is the evil twin and wherein people faced with tough choices actually make a decent effort to act with wisdom and justice.