I really don't see the point anymore. I'll actually drive it 5-10K a year. Car seats in the back, setting off car alarms, ect. The days of numbers cars sitting in old farts garages is drawing to an end. The market of buyers is shrinking for sure.
I agree that the market for SOME of the muscle cars is coming to an end. The geezers are passing away or losing interest because of higher priorities. It is harder for them/us to crawl around and fix their own cars. Parts are getting more expensive, if you can find them. [1970 Dart 6 cyl exhaust system NLA. Or $400 plus install from Mancini racing].
The high end rare cars will always keep their value. But these cars are reserved for the rich who drive to car shows and then park them in air conditioned/heated garages, pay high insurance premiums, etc.
This 'market fallout' happened to Model A Fords a few decades ago, but they came back.
