Tommy Chong has hardly fallen off the map. He did voicework for Zootopia* which came out this year and has had several other recent projects plus at least one in the pipe-(ahem)-line.
Regarding his prison time a while back. While in prison he started writing an autobiography (it’s fairly interesting, considering). This inspired his cell mate to write a book about what got him into prison. That book got a lot more attention.
Rich Little. You couldn’t turn around in the Seventies without hitting him doing his impressions (which I always thought sounded like Rich Little trying to sound like Nixon even when he wasn’t doing Nixon, but whatever)
Doug Henning, the magician. With his huge mustache, long curly hair and polyester jumpsuits, he was like the Seventies distilled into its essence.
The last I heard of Rich Little was in the Futurama movie Bender’s Game. He played his own head in a jar imitating Howard Cosell.
Good examples. They were both ubiquitous when I was growing up in the 1970s.
Little apparently still performs some, though I suspect that he still does the same impressions he was doing 40 years ago.
Henning retired from the stage in the 1980s, getting more involved in Transcendental Meditation, and in a couple of very unsuccessful runs for political office (in England and Canada). Died of cancer in 2000, which would explain why he’s been so quiet of late.
After the notorious White House Correspondents’ Dinner in which Stephen Colbert dismantled George W. Bush to his face, they invited Rich Little for the subsequent event a year later in an attempt to make sure the entertainment was COMPLETELY inoffensive (which it was, since the vast majority of Little’s repertoire is people who have been dead for quite some time at this point).
Reggie Jackson, Dr. J, Carl Lewis?
Maybe not completely. But sport is like that.
Madame was a regular fixture on panel game shows and morning TV throughout the 70s, then fell off the radar. After a brief return to stage in the early 2000s, she sadly lost her battle with dry rot in May of this year.
(Puppeteer Wayland Flowers actually died of AIDS in 1988. The Madame puppet did appear in a stage show in the 2000s, though).
Looking up Sarducci, I was surprised to learn his sister-in-law was US Surgeon General.
She has had a rather chaotic life in the years since, and wishes to keep her life quiet and private nowadays.
Jan-Michael Vincent was famous for a tv show in the 80’s, ‘Airwolf’. His real-life story should be titled ‘Trainwreck’. Decades of alcohol and drug abuse, DWI’s. arrest after arrest, health problems, a leg amputation. Something was badly wrong with him from the get-go.
I don’t see a mention yet of Erin Moran of Happy Days & Joanie Loves Chachi. Between the two over 250 episodes.
Really went downhill. At one point living in her husband’s mother’s trailer and getting into drug problems. Her career effectively ended in 1986 and has done very few random/cameo things since. Nothing since 2010.
Chuck Muer.
By an amazing coincidence, just today one of those clickbait things that showed up on my screen was “What Erin Moran looks like now is jaw-dropping!”
I did not click on it, thus my jaw remains undropped, but I had heard that things have not gone well for Erin since the end of Happy Days. Sad.
Arthur Godfrey has been mentioned, but not how ubiquitous he was in the 1940’s-50’s. Not only did he host an hour-and-a-half radio talk/variety show 5 days a week, aimed at housewives, he also had a weekly talent hour on TV, not unlike America’s Got Talent. I think his only talent was playing the ukulele, which put him one-up on Ed Sullivan.
Still, Sullivan is better remembered today because he introduced America to The Beatles and provided one of the first live national broadcast appearances for Elvis Presley. Oddly enough, Elvis tried out for Godfrey’s “Talent Scouts” but failed to make the cut for the show. If that had not happened, Godfrey likely would be remembered today as the man who introduced Elvis to the world.
Didn’t he also fire a guy live, on the air?
Yes, Julius La Rosa.
Ice skating champion Debi Thomas has not done well either; among other things, in recent years she has been unemployed and broke despite having an MD degree. 
The Fall of the Mighty: Clark Gable’s grandson is the host of Cheaters, and was arrested a few years back for shining a laser pointer in a police chopper.
My offering (can’t see if they’ve been mentioned yet)
Her first husband (whom she married shortly after the Calgary Olympics) was a high school classmate of mine. The marriage didn’t last very long, which was likely a harbinger of things to come for her.
