They could have done more with the Urkel character:
The show was dull and boring till Urkel showed up-Jaleel White's character helped save the show.
They could have done more with Urkel- make him a spy/superspy/secret agent, a superhero, a cowboy, an adventurer, etc.
They could have had an Urkel Saturday morning cartoon spin-off, or an Urkel Family Matters comic book.
An Urkel video game.
Wouldn't you agree?