nothing should be brought back. that's half the problem right there.
It's hard for brand new series to get traction. I think the REAL problem is apparently TV execs don't like science fiction TV anymore. Maybe it doesn't get enough viewers, I don't know. All I know is that I'm running out of shows to watch. Star Trek, B5, Stargate, Firefly, BSG... I've seen them all.
I'm also not a huge fan of the "dark and edgy" theme that the more recent shows have adopted, but that's maybe just a sign of our times and if things get better we can go back to fun, adventurous stuff. If another sci-fi show ever gets made again. Everything these days is reality TV, sitcoms, medical dramas, and cop dramas.