What is it that notorious car-drivers hate about public transport, so that they end up spending like 5-10 times more money than what public transport would have cost them?
That is the question that you need to answer before you can make predictions like in the slashdot summary.
Public transport has "quantization noise". If you leave for work 3 minutes later, you'll miss the bus, and end up at work 15 minutes later. Sure you can prevent that. Just be at the bus stop 5 minutes before the bus. This means you invest 5 minutes every day to prevent a 15 minute occasional delay.
Second: when you use public transport, you don't have "your own space". This means that if you leave your wallet, ipad or whatever lying around when you step out of the vehicle, barring exceptions, it is gone. If you have your own "transport space", you can also stock it with stuff you might need while travelling (e.g. my brother has mints in his car), of that you might end up needing at the destination (e.g. umbrella).
Third there is a cost issue. If you see the cost to you every time you move, that makes you consider it more. People ignore the: "the car needs xx petrol to drive this far, so it costs me at the least yy to make this trip". They see the filing up and paying whatever that takes as something that must be done, and then they pretend driving the car is free.
Those are the things the car-drivers will need to have satisfied before they can be converted. And if you don't convert the car-drivers you will not have the economy of scale to have "leaving out the steering column" make a difference.
The current topic will "solve" the quantization noise. You hit a button in your house a few minutes before you leave, and the system will get a self-drving-car on your driveway before you close the door. It does not solve the other problem. You cannot leave the umbrella in the car "in case it rains when I get there". You forget your stuff and the next occupant might take it. (or at least "where is my presentation" is not solved with a run to the car park).
The "self driving" and "semi-public-transport" ideas will only work if everybody gets to keep their private module. Those could be powered with say a small 1kW motor and have a 40km/h (25mph) speed limit. Then when they end up at the freeway, a bunch of them group together with a "power-unit" and they can travel on the freeway at high speed. (Pay more and the "maximum grouping delay" goes down).