That's an interesting point, and also seems to fit in to the supersonic jet narrative: people aren't willing to pay a (sufficient) premium to shave a few hours

That's an interesting point, and also seems to fit in to the supersonic jet narrative: people aren't willing to pay a (sufficient) premium to shave a few hours off a flight. In the same way, you might be willing to accept a couple of extra hours travel time to be in the comfort of your own vehicle.