I'll simply add-look at the situation in the other direction:the generation before us,that bought and restored Model Ts and As,etc.My generation(age 57) relates to the 60's cars,no so much with that vintage eventhough I like them.Though I haven't looked at antique car prices,I think some of them will slide as that generation passes on.
Quality/fine workmanship has transgenerational appeal-people will always want the higher end stuff.The plastic and ugly stuff of today will never enjoy a collector market in the future,in my humble opinion.
Classic stuff is just that-timeless in it's appeal.