Nope, Fieros, like the Pinto, had this annoying habit of bursting into flame. Unlike Pintos, Fieros tended to do this rather spontainously, without bothering for the need to have someone tap them on the rear end.
I haven’t seen the VW Thing in ages, but then, why would I want to?
My in-law’s neighbor has a 1956 Hollywood Hudson Hornet for sale. I hadn’t seen one of those since I was a kid. Its been in his garage for 10 years. It was in someone else’s garage before that. It has 13,000 miles. My husband just about pees himself everytime he sees it. (Sorry, but I think its ugly, and we don’t have $6000 to waste on a toy)
When I was a small child, my mom got a brand new Javelin in dark metallic green finish with all of the extras. I didn’t pay much attention to cars, so I was really surprised when other kids started telling me what a cool car my mom had. Today, looking back, it doesn’t seem like a typical mom-mobile of the Seventies (that would have been a station wagon with fake wood on the sides).
When she traded it in years later, it was almost rusted out (Michigan winters), but that didn’t keep the dealer from using it as his own personal vehicle for a few months.
Dodge Dart. Yeah, it was pretty much just an anonymous box, but those cars would run, and run, and run some more until they rusted away, at least in my experience as the former owner of a '73 Dart Swinger. (I inherited it when it was replaced as our family vehicle by a new(er) car, didn’t buy it myself.)
It’s not like there were all that many GTs to begin with. Just over 103,000 total.
The bookkeeper at a radio station I worked at drove a Yugo. Told me this one:
Q: Why do Yugos come with rear window defrosters?
A: To keep your hands warm while you’re pushing them.
In other news, I owned a 1976 Pacer DL for about 3 years. Bought it new, it had the 232 6 cyl. engine. Slower than snot in an icestorm, the fastest I ever could get it up to was 75 miles an hour (downhill), unreliable, but what ROOM it had inside! I actually slept stretched out in the car a couple of nights on a church campout.
I once owned a Mustang II hatcback. It was orange and black and had a 302 V-8. Ungodly ugly.
My room mate in college had a Ford Maverick, which we called the Mavaratti. I suspect there was about a pound of high quality roaches under the seats. Another room mate had a Gran Torino, which we called the Grand Toilet. Still another had an International Harvester Scout. It was lovingly called The Box. Which vehicle we took depended on where we were going - a quick pizza run, take the Mavaratti. A longer road trip where you needed a little more room - we take the Toilet. Fishing, camping, or general hell raising where we might hit something or someone - we Boxed it.
College is so much fun, ain’t it?
It’s funny. I’m involved in the rally scene (rally as in driving fast on dirt, not timed events where precision counts), and that seems to be where a lot of the missing cars are going. We get a lot of cars mentioned in this thread driving out there, such as Merkru XR4Tis, Honda Civic wagons (the rare 4WD combo, even), Syclones, Escorts, etc. We also have a lot of 1980s and 1990s cars that many people haven’t even heard of, like my 1988 turbocharged 4WD Toyota Celica.
So the answer to where these cars are going is: They getting turned into race cars because they can be had for dirt cheap.
Escort
Festiva
Dodge Dart The original Old Lady Car. I want one really bad. The car.
Chevy Kingswood Station Wagon I want one of these too.
Chevettes
You should come up to the Dream Cruise in Royal Oak, MI. You will see all of these cars and much, much, much better ones cruising Woodward Avenue. It is highly recommended and I think it is August 21 weekend this year.
Quite the event if you like gawking at cars.
Best of all, its free.
I think all the Fieros were “kit kar’ed” into fake Ferraris and Countaches.
A friend in high scool had a '73 Dart Swinger (a contradiction in tems if there ever was one.) We were driving on the highway one day when his oil warning light came on. I nearly yelled at him, “Hey, you’re out of oil!”
He answered, “Oh, that light always comes on.”
I replied, “Well add some oil.”
“Why? It’ll just come back on in a week or so.”
He drove that Dart through high school and was a sophmore in college when the engine finally seized.
Then there was my dad’s '63 Dart. Dad used it to pull tree stumps when no other car or truck could do the job.
That’s another one whose name escaped me. I remember that back in the late 1980s, the Honda Civic wagon and the Nissan Axxess had a reputation, at least in my area, of being popular cars among lesbians. Go figures.
I dunno, those big ol’ bench seats in the Dart came in pretty handy with one ex-gf in particular … 
I read a book that was essentially “The Fall and Rise of the American Auto Industry”.
IIRC, the book said that Fieros were made with an oil pan that was about a quart undersized, because of the dimensions available for it. This resulted in a fire in about one in 4500 Fieros. Imagine that ratio in the country at large. The roads would be choked with flaming wrecks.
I saw a '51 Packard ragtop the other day, in excellent condition. Awesome. 
And you know, the guys that convert the Fieros into Countachs and Ferraris tend to shoe horn a 350 Chevy into the things. Wonder how they keep them from going up?
How about those two billion Geo cars - mostly Metros - that were all over the roads a few years ago? Where’d they all go?
I’m going to take a guess and say they were replaced by Kias.
Another Yugo joke:
Q: How do you double the value of a Yugo?
A: Fill the tank with gas.