Yeah this is the really interesting part - like where does the 'supply provisioned precisely to match demand' thing for self driving cars meet the 'buses/trains

Yeah this is the really interesting part - like where does the 'supply provisioned precisely to match demand' thing for self driving cars meet the 'buses/trains are more efficient assuming some % capacity filled', how does that relate to demand changing with hours of the day, where people live, etc. It's just a fascinating optimisation problem. I think the answer is far from clear, and certainly couldn't be reliably approximated without lots of real world data.