"A good indicator would be cruise nights, cars and coffee, car shows, and swap meets. "
For me a Good indicator is people are restoring Four doors and wagons,,,,,,,,,,,,,,,,,,amazing!
ALOT of parts and car will be available in the Next 20 years! (That was not a Gorey negative statement) just an eventuality - reality.
as a point My family had to (Chose to) liquidate Dads Model T's, Packard, Hudson Etc, just as someone will distribute my Super sports and Z, as the world turns.
Enjoy them (& the friends) as best you can