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Even if that's the case, it isn't elitist to suggest we privilege cheaper modes of transport.

Your scenario cannot scale by definition (used)

Your scenario has no answer for the externalities.

Essentially, the only reason the scenario has any sort of standing is because it's based on the idea that commuting by personal vehicle is inherently better than public transport. Which is true for most of the US but is not true for most of the places which actually don't a priori assume personal vehicles are inherently significantly better for transport.