Naw, due to climate chaos, we'll have widespread civilizational collapse and the plain breakdown of the car-supporting infrastructure within less than 50 years.

In a Mad Max world, cars are more likely to keep working than trains or buses.

I haven't read the https://en.wikipedia.org/wiki/World_Made_by_Hand series but my impression is that Kunstler would agree with you except with the caveat that there won't be cars or trains or buses overall, mostly just return to actual low-scale functioning like horses.