I am not sure that the posters here bar a couple understand that the modern car, with its computer controls over most things, will last a very long time. Many manufacturers are offering five-year warranties. The longevity of the modern automobile has actually increased over the ones from the 50s, 60s, even the 80s and 90s.
The most significant "throw-away" or disposable commodity issue is that because of crash and safety rules, the modern car has crumple zone that are virtually unrepairable and will leave a car with what used to be seen as minimal damage as a write-off; and in many jurisdictions, that also means they will never been licence-able again, so are headed to the car graveyard. Body shops are probably the most vulnerable right now as far as on-going business is concerned.
Just wait till electric cars really take a hold. No gearbox and comparatively few moving parts. You know how long industrial-grade electric motors can last. But as I have said before, the car as a form of personal transport won't be going away soon.