The future surely should be less cars, not more cars.
I'm more on about small electric buses which drive themselves up and down motorways and a-roads, for long trips, going common routes, and very often, so often you don't need a timetable, and can just see where they all are on a map etc. Think of it like smaller trains, on more routes, going a lot more frequently.
If this works, which it should, as more vehicles could mobilise at peak times and could park and charge at non peak times, then it should take tons of cars off the road.
It needs to be comparable to an individual's car trip though, in a way, or be cheap enough where the slight extra time for travel is better than paying for and driving your own car etc. The idea is to build a massive public transport system which actually works, if it's seen as more expensive or more of a hinderance people won't use it instead of their personal car.
People could even keep their personal car with limited range, or have a hire lease agreement like how you do on e-bikes etc.
It's fine if they're electric I think, and as they could replace personal car ownership the number of cars and personal trips in an individual car should reduce.
It's daft having tons of cars, which are parked up 90% of the time, and just sat there losing money in depreciation. Then it makes it even more stupid when you have 500 people following each other on a road in 400 different cars etc.
Being driverless for a lot of routes should open tons of doors which we've never had prior.