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>all of them are capable of being overprovisioned.

Do you think the voters of any major city would agree that it is too easy to get from place to place?

>Mobility can be much more efficiently provisioned to the public with transit.

I think this is at least sometimes true, depending on factors like geography, density, labor costs, etc. But it's orthogonal to whether there is too much or too little mobility. You could take the efficiencies of public transport and deliver better overall mobility with the same budget. That's an easier sell for the public than "that extra hour with your kids after work is unsustainable and you don't really need it" or "having your own house in the suburbs is wasteful, share an apartment with 3 other families in the center instead."