Here's one you might not remember. "Diff'rent Strokes" spun off "Hello Larry" and "The Facts of Life." I think you're right, Pippinwhite: spin offs used to be more frequent than they are now, and they're usually comedies.
Even if I didn't like the original show, I'll often check out a spinoff, just to see if it's any better. Sometimes yes, sometimes no. I always liked "The Jeffersons" more than "All in the Family." "All in the Family" was a little too "relevant" for me. But most network TV is hardly worth watching these days, anyway. There are a few good shows on, but most of it is just garbage.