The advance of technology has made the modern passenger car virtually impossible for the average teen to work on. This, more than anything, has destroyed the car-teen relationship so prevalent in the "old days". Teens today see the car as just transportation and not a life style. Almost everything revolved around the car in the 50's - theater, drive-in (food and theater), cruisin', hobby, chick attraction etc. I see some kids doing that today but nowhere near the number when I was a kid.
Pass any urban high school parking lot now and see the difference. In the old days you'd have a number of home built hot rods, a few classics, some trucks and a few "rich boy" cars. Now it is almost all the latter. More girls are driving cars that daddy bought for them and most guys seem to like the econo-boxes where the stereo is larger than the motor. Student parking at my local high school is $75 per semester and the lot is full year after year (juniors and seniors only need apply). Kids are apparently more affluent now than back then. (Disclaimer: I do live in a more affluent area so my school may not represent most.)
My personal car is connected but I very rarely use any of its features. And I will teach my granddaughter, when she is old enough, that driving is driving and not fooling around with a variety of techno-gadgets on the dash. When you're good enough you get to listen to the radio (if they still exist then) but that is it. No texting, browsing, videoing, etc. In fact, she will probably get my car - after I have disabled all the tech gadgets in it.
One last comment.....I notice that most of the younger drivers around me tend to have players in their cars and are not listening to the radio. This also does not bode well for radio futures in the dash.