Just means that some of them wll become much more expensive as you try and get a used one. Such as Viper. I saw a solid Black one last night, and it was awesome. Don't see them much in Albuquerque, New Mexico.
Chrysler PT cruiser was a nice little fun-run. Wasn't great, but was one of the first retro jobs that was successful, and led to the popularity of the current Mustang and Camaro retros.
My best friend was interested in the Honda S200, still is one of nicest two-seaters around.
I was a kid when I heard that Studebaker was closing (in mid-60's), and didn't really know much about it, since I heard their rep was pretty dismal. But they still had some interesting lines and designs....for the time. But cars have been going under for more than the 100 years they have existed. In fact, the greatest time of car collapse was probably in the 1920'-30's, because there were so many independent makers or factories creating their own vehicle. Just couldn't win out over the popularity and advertising of the bigger companies like Olsdmobile, Chrysler, and of course, Ford. Eventually they either went under or were bought out by larger firm. That's part of automobile history and its nature (cleansing of the herd!!).