Although I haven’t seen the show in years, I don’t think the *Alice *sitcom really jumped the shark.
Of course, Flo (Polly Holiday) left for the disaster that was Flo. But, the show continued to revolve around Alice, Vera, and Mel as well as the new waitress Jolene.
The best episodes were during the seasons Polly Holiday appeared, but I remember the later episodes as being watchable for a good laugh.
Nope just made a mistake 
I shall blame faulty memory. Thanks for the correction.
Bonanza survived the departure of Adam (Pernell Roberts) and the introduction of Candy (David Canary). But it jumped the shark when Candy left and Ben Cartwright adopted teenager Jamie Hunter (played by Mitch Vogel) in 1971.
Yeah, but then it jumped the shark in its fifth season.
Arrested Development
The Rockford Files
I, Claudius
Maybe “jumped the shark” is too strong, but it wasn’t quite the same after Cleese left.
Also, in the movies, Meaning of Life shows quite a decline compared to Holy Grail and Life of Brian.
I’ll second The Rockford Files. It was consistently good until the end.
And instantly the theme song is lodged in my head! Thanks! (not sarcastic - great tune!)
Perry Mason? Of course, given that much of it was based directly off mystery novels and it didn’t really have overarching plot development, I guess it doesn’t count.
Although Raymond Burr did turn into a whale by the end.
I agree with every word.
And allow me to boldly add Gomer Pyle, U.S.M.C.
mmm
The Andy Griffith Show.
It was never that great, but:
In the first season, Alice was still struggling with the death of her trucker husband, and the plots were very real world and human.
In a later season, Mel hired a robot waitress.
It jumped the shark.
Blessed are you, for you have never seen a color episode of TAGS, nor apparently do you know they exist.
If you’re referring to Mayberry R.F.D. that is a different show.
Any of the shows with Jack Burns are dead to me.
The Wire went for more than 4 seasons.
Nope, talking about the ones after Barney left. And apparently so did most of the gag writers. Entire episodes without a laugh. Ever seen the one where Aunt Bea and the church choir threaten to disband if they don’t get new robes? But Howard Sprague says the church needs a new foundation?
I luckily must have missed those.
It jumped the shark when Doug and Carrie decided to adopt a baby.
True, it never jumped the shark, but 3 seasons is not what I’d consider long running.
+1 That episode was HILARIOUS
“Chicken Pot, Chicken Pot, Chicken Pot Pie!”