Has there ever been a time when good Sci-Fi was on TV with any regularity?
Now seems to have about the same as most other times. Stargate still has a spinoff, "V" is back on, we have Doctor Who, SyFy has a couple shows that look decent, and theres a lot of hype for Terranova, some new show about time travel.
EDIT
I never saw them, but aren't "Flashforward" and "The Event" major network sci-fi?