> And yet people don't buy single-seater cars.
I'll postulate people don't buy single seater cars because they don't exist. (At least in the US?)
I've long wished for a very small single seater car, something under 1000lb, only needs a tiny engine so it could have very high MPG and yet still be very fun.
The only way I see to change that pattern, outside of getting rid of cars completely, is a full switch from ownership (or "ownership" aka leasing) to fine-grained rental.