I don't think the car culture is dying, I think it's shifting, not only due to the age of the cars, but due to the cars themselves. Back in the day, you had to know how to mechanically improve a car to make it better. Today, the same thing is being done with electronics, mostly by the manufacturer, but even still, there's room to improve the tune on most cars.
Looking at it from a cost perspective, 20 years ago you could buy all the pre 70 cars you wanted for a few grand, today, even a rusted out hulk of a 60's era muscle car can be over 10 grand, which means collectors and builders are going after 70's era cars and now those are being pushed out of the "average Joe" market, which means the 80's and 90's era are next.
There will always be a decent car or two, no matter what year you choose from, but IMHO, very few vehicles since the 70's have had any amount of styling worth mentioning. Easily since the 80's, everything looks the same, and it's only gotten worse as the decades march on.
As for myself, I was into cars in my youth, went through auto tech training in the 80's and promptly jumped out of the industry. With the recent purchase of my Suburban, it has rekindled my affinity for vehicles. I've enjoyed giving the Burb all the TLC she's needed to bring her back to her former glory, and I look forward to purchasing another "project" car in the future. I'd love to find a few local folks to turn wrenches with.
Which brings me to another point, most young and dumb kids can't afford much for a vehicle, and I think most of their time is spent getting their careers in order. Once they get a little age under their belt and more financially stable, then they start coming back to having fun with cars.