Chevelle boys and Ford guys are going to watch their rides go to the entry level price range, because no matter how rare they claim it to be they made hundreds of thousands of those things back then. Younger GM boys like Camaros and G body cars. Younger Ferd owners want a modern Mustang and could care less about the old ones. That is Ferd's fault for switching to OHC "modular" BS and destroying their own reputation for anything newer then a Fox body. Youngsters for GM would as soon "LS swap" something then buy an actual muscle car.
Chrysler though, well, they maintained a performance attitude until recently as a main marketing tool. So there is demand from multiple generations. Names like "Hemi" and "Charger" resonate to all ages, and a certain movie franchise helped link the two worlds of modern and old.
A lot of youngsters like EV's. But I think the market for EV enthusiasts is niche, personally, and I don't see the enthusiast group gaining numbers at the same rate they did in the last ten years. EV's have no soul.
I also think the current trend of the auto makers to only sell enormous, overpriced, super heavy, unreliable crap is going to prop up the old car market for a while. A young coworker just told me last Thursday they are sick of their car(late teens VW) and are going to go look for "somthing old, like a 1990's Ford Ranger or an old Toyota tacoma" because they are sick of the electronics in their reasonably newish car failing. A tall order in WI rust city, but I understood the sentiment. That desire to have something simple and easy to repair, reliable, maybe with a stick shift is going to keep people looking back at what we had more and more. Been a long time since I heard anyone excited over some new model of anything from any brand.