Steam engine made operational cost of transport an order of magnitude cheaper (while capital expenditure was two orders of magnitude higher) by using coal instead of oats (and locomotive instead of a horse-driven cart).
Self-driving cars will lower the operational cost of transport by another order of magnitude, but barely raise capital expenditure, actually probably concentrating it dramatically (as Waymo will probably build cars that cost double and can drive ten to a hundred times further).
Self driving car is essentially tele-transportation in your sleep.
