This is definitely along the lines of what transportation tech has done to date. Instead of new replacing old altogether, the options just get more flexible ove

This is definitely along the lines of what transportation tech has done to date. Instead of new replacing old altogether, the options just get more flexible over time, easier to "packet switch". You don't take just the bike or the bus, you take the bike to the bus and open up a set of possibilities different from the two alone. Likewise with the new generation of small EVs, visual processing, and networking, you can scale the infrastructure for everything more exactly, with a variety of vehicles of different sizes and carefully synchronized transfers, instead of forcing car traffic into primacy. From that perspective it's easy to see why PRT was a hard sell - it's less flexible than a car and it doesn't have the capacities of light rail. The automation part has stuck, though.