People like to be able to go to a precise location in one trip, and not "somewhere near" at the time they want. A train is brilliant if you simply need to move between locations which are close to a train-station, but not so great if you have to change trains, then get on a bus / taxi, etc.Here's a crazy idea... build a world where you don't need cars much at all. This obsession with cars - autonomous or otherwise - is not healthy.
I'd rather catch a nice train, with a driver up front with skin in the game.
Electrical cars are great, but the fuel-cell / battery is not. Limited miles, takes ages before they're full, and you have to plan where you can fill the battery... and of course the chemical waste in due time once the batteries need to be replaced.
Hydrogen seems to be closest to the answer. But, I also hear problems with the amount of electricity it needs to generate hydrogen in the first place.
Something tells me that this "issue" will always stay, one way or another. Energy will never come free. But it will be great to be less dependant on oil.