A highly used system would be able to do it all, cars to take you to a bus, to take you to a train, bus at the other end, and then more cars, all scheduled JIT.
Throw in a standardised luggage system and lockable storage boxes at stations etc, to keep all the stuff you have around in your car, and you're getting somewhere.
Charge someone who wants to travel alone by car 10x as much as those who share and move between modes of transport
Then they charge you for all luggage like the air planes. While plastering you with targeted ads. I dont know what the future is going to look like more...idiocracy or black mirror.
Right now you can get in your car turn off your phone and radio and go where you want in peace. I bet they build a tier systems with autonomous cars. Pay this much it will go this fast. Pay more it will go faster. There will be like 3 major companies and like the internet providers you will have to pick the lesser of all evil.
Do I think they are cool, yes. Do I like the technology, yes. Do I like where the businesses will go with this technology, no.
Super easy to move between modes of transport if you don't have kids.
Moving the car seat alone makes car sharing a huge pain. And it's true now more than ever since now there's a social/safety expectation to have children in a full seat or booster seat until they're at least 10-12 years old.
Of course, if you have children, you're not using the car alone.
Many states do not require a carseat in a taxi. California is not currently one of them, but I can see this changing when more vehicles on the road are automated.
Throw in a standardised luggage system and lockable storage boxes at stations etc, to keep all the stuff you have around in your car, and you're getting somewhere.
Charge someone who wants to travel alone by car 10x as much as those who share and move between modes of transport