^A lot of people assume that science fiction needs to involve space. Maybe that's what they really mean, that there aren't many space-based shows anymore.
I use "sci fi" pretty broadly to mean stuff that is near future semi-sci fi like Person of Interest
and even fantasy tinged stuff but when something has a space element, I pay more attention because of the rarity.
Defined broadly, sci fi is doing great because shows like Revolution, Once Upon a Time
manage to latch onto loyal audiences, which is nothing to sneeze at in the broadcast world now. We'll get a crop of new sci fi/fantasy shows on broadcast next season but nothing too earthshaking. I could go for a couple shows that break more from the pack.