I would add "Bumper Stumpers" to the list. Granted, it was an excellent show and I really enjoyed it, but HOW did it stay on for three years? That still boggles my mind to this day.
I'm also surprised no one mentioned "Trivial Pursuit." That was on for a good 2-3 years and, IMO, should've only stayed on about 4 months! The first half-hour was BORING, and the second half-hour was watchable, but very bland in gameplay, IMO. I guess it helps when you're on FAM!
To stray from the cable market, I'd say a network show that stayed on longer than it should have would be "Liar's Club" (okay, syndicated). I found the game to be too close to TTTT and the betting system was okay, but why were they all such wimps? Perhaps I'm exaggerating here, but did any of the contestants go for max bets the first few times around?
Oh, and one more cable one: "Figure it Out." I thought it had the makings of a good panel show when it started, but with questions like, "Do you like cheese-flavored crackers?" and Secret Slime Actions like "Having the first name Lori-Beth" rearing their UGLY heads after the first few months, my interest in the show quickly faded; how did it get two seasons?
Anthony