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> where they continue to run for another decade or so

Or another 50 years. The modern western disposable culture isn’t global, although is certainly envied by many who don’t have it.

Of course some cars live essentially forever somewhere, but I think the fraction that passes the thirty year mark is rather small.

It's the oil infrastructure that will affect them, because it's global. If that goes away...

It won't go away, but there's good chances fuel gets a lot more expensive as production scales back.

Which is another feedback loop, high cost, shrinking demand, shrinking supply, rising cost.

Also oil has high fixed costs. Stations, tanker trucks, refineries. Fewer customers carrying them means they rise as a percentage of purchase price.

Assuming you can easily get parts.