I admittedly didn't read this entire thread, but I'll throw in my two cents.
As it stands, I'm a 37 year old, dyed in the wool car enthusiast. My dad was a car enthusiast, so my exposure to cars has been there since the very beginning. Growing up in the 80's and 90's, the Malaise and Rad Era cars were what I coveted, and I had a strong reverence for the older Musclecar and Pre-War Classics eras as well.
Cars were "cool" when I was growing up not just because I was indoctrinated into the culture early; just look at the media and toys of the day. Hot Wheels were going stronger than ever, Transformers were all the rage and transformed from cool vehicles into robots, every toy line with action figures (And even Barbie!) pushed the availability of cool "vehicles", and companies like Tyco blasted commercials with cool stuff like their awesome 9.6V RC line and slot car tracks that climbed walls while glowing in the dark! Cartoons, kid's shows, and movies of the time all perpetuated car culture as well. Inspector Gadget had a weird Japanese van that transformed into a sweet sports car complete with louvers and pop-up headlights, Knight Rider had a 3rd Gen Trans Am that was faster than anything on the road at the time, Back to the Future featured a time-travelling DeLorean... I can go on and on. And I wanted to be part of that. Almost every kid at the time did as well!
Fast forward to today, and I have two nephews (aged 16 and 21) that are growing up in a different time. There is certainly less exposure in the mainstream, yet there's more overall exposure to cars and car culture due to the existence of the internet. Are kids today even aware of cars? They sure are. The 16 year old has taken a keen interest in anything mechanical, and the same goes for just about all of his friends. He and his friends are just starting to get their licenses, and while he has a 2004 4Runner, he has a friend with a 5th Gen Camaro, another has a 90's Ford with a 7.3 Powerstroke, etc. He's also into small engine-powered stuff, and has put together multiple go-karts and minibikes over the past few years. He's shown interest in picking up an 80's Z car, a F-Body, and/or a Fox Mustang in the past few years. While he's straying away from video games, the cars he's idolized in Forza Horizon and the like are the ones he covets, just like the cars in the early Gran Turismo games for my generation.
The older one is a more complicated case. He doesn't have his license yet, and it's not for a lack of trying. I've gone driving with him a few times, and while he's interested in it, he's going to college right now and doesn't have time to get his stuff together to pass the test. He definitely needs some more practice. That said, he likes driving my Mazda 3 with a manual more than driving any of the other vehicles he's driven, all with automatics. He tells me that he feels more connected to the car, and likes having the added control over what the car is doing. He is into things with style and "aesthetics", so I can see him turning into a VW guy once he sorts out getting his license. He already looks the part of a young kid with a GTI, or even a Miata.
Last year, I went to a national NHRA Top Fuel event. There were kids EVERYWHERE which I did not expect, and the place was sold out for the entire weekend. Following the awards, kids were going up to the drivers and asking questions. And not just a handful; there were a ton of them! The drivers and crew identified this and were very accommodating. The winning driver even gave a kid a crankshaft from one of his race engines! Since there's basically zero advertising for this kind of thing these days in the mainstream media, it was refreshing to see.
Where does any of that leave the fate of sports cars or car culture in general? It's hard to say. In this day and age, just about any interest can be satiated through the click of a button with the amount of information on the internet, but sparking that interest is the hard part. The closest thing we have to car culture in the mainstream are racing video games and whatever the Fast & Furious movies have turned into. Even so, walk near the toy section of your local Walmart or Target and you'll likely find a giant Hot Wheels standee in the center aisle promising cheap thrills. As long as those things are still there, you can bet on a kid digging in there and grabbing their future as a car enthusiast.