[dragonwriter]

I suspect this is more a matter of what "sci fi" you like. The 1990s had lots of sci fi TV shows, including, among others:

X-Files

SeaQuest DSV / SeaQuest 2032

More Star Trek than you can shake a stick at (TNG, DS9, and VOY cover the whole decade, with most of it having two at once)

Babylon 5

Sliders

Stargate SG-1

Farscape

I think there's a better case that the 1990s were the high-point of sci fi popularity on TV than a particular drought (though I can see a case that there was something of a drought starting sometime in the mid-1980s through 1993.)