Richard Thomas, "John Boy", left the series after Season 5. Ellen Corby, "Grandma Walton", suffered a stroke in November 1976, then was not in any further episodes until 1978, and only on a very limited basis because her stroke greatly impaired her ability to speak. The quality of the episodes without the John Boy character nosedived in Season 6, with many contrived storylines and the limited acting ability of the rest of the cast portraying the other six Walton children. Then Will Geer, "Grandpa Zeb Walton", died after Season 6 had been completed. The producers should have called it quits after Episodes 1-2 in Season 7, which were a tribute to Grandpa Walton and Geer, and the storylines continued to get worse. Michael Learned (Olivia Walton), also curtailed her performances on the series, and the writers had to come up with some dubious reasons why she'd be gone for much of the time, then reappear on occasions. The "Jump the Shark" moment came in Season 8 when they introduced not one but two "Cousin Olivers" (the Brady Bunch had just one) and even a fake John Boy! Given Richard Thomas's strong portrayal of John Boy for the first five seasons, the producers should have been smart enough (I know that's expecting a lot) to realize that a Fake John Boy was a terrible idea. The two kids were gone by Season 9, and I don't remember any explanation being given. In Season 9, the writers even came up with a fake Curtis, "resurrecting" Mary Ellen's husband, supposedly lost at Pearl Harbor in Season 7. The associated storyline was equally ludicrous. After that, the producers, who were obviously more concerned with the Bottom Line than program quality, fired Ralph Waite after just a few episodes in Season 9 in order to dump his salary. With the real John Boy, Grandpa, Grandma, Olivia, and now John Sr gone from the cast, , Season 9 was a complete embarrassment.
