I'm sure this has already been written but here goes:
The TV audience today is not the same as it was in the 70s, 80s or even 90s. The audience today needs something that is intelligent, not full of politically correct cliches etc etc.
I think if DS9 had been made today(Or Babylon 5) it had been a bigger success than it was because today the audience demands story arcs and plausible plots that aren't rediculous.
Television is actually the medium where the best work is being done today. There is just too much runtime, even a 13-episode season, to get away with just using explosions and CGI - there needs to be characters and a story that is interesting.
Now, I should qualify that by saying cable
television - basic cable, premium cable, even Netflix, but the over-the-air networks produce almost nothing of value.
Sons of Anarchy