I suspect the problem is at least partially related to a sharp drop in the quality of television in general. I've never been a big fan of TV, but the changes I've started to notice lately are mind-boggling - it has become worse than I ever imagined.
It seems that the networks aren't finding �intelligent� programs marketable anymore. That may have to do with the demands of sponsors, which I'm sure are related to other things as well.
Have you noticed that even on "legitimate" news programs, a lot of the kyrons end with exclamation marks now? I don't know if I'm looking at a news program or the National Enquirer - so I shut off the TV and hop on the net or look at the paper for news.
Anyway, I think sci-fi feels the negative impact of this shift more than some other genre.
I'm hoping that as more programming becomes available via the Internet, we'll start to have access to new shows targeted to our interests soon!