Why can't the old Knight Rider be the new Knight Rider...

Sadly, I finally came to the end of the 53 episode run of Arrested Developement.  That show was made up of so much win, that I can only wonder, how in the hell is a show like the new Knight Rider still around, yet Arrested Developement is canceled?  I suppose I’m partly to blame since I never watched the show while it was actually running, but Jesus, why didn’t someone tell me back then how good it was?  This same crap happened with Firefly too.  At least someone at Fox was smart enough to bring the Family Guy back.