Despite the fact that I worship at the altar of the fast car - I subscribe to Mike's vision of a potential way forward. I can't see how you can label it as "re-imaging of the same" bus trips for hundreds at all, exactly because of the differences you illustrate.
My work is relatively flexible. Some days I need to be in work at 6am and be in work for 13-plus hours (for 9-plus hours flying time...), while others I'm in at midday for a 5 hour work day, yet others are "normal" 7:45-ish or 8:30-ish to 4:30-ish or 5:30-ish, so the buses of which you speak would of course be inappropriate. When possible I also travel home at lunch time to let the dogs out and feed the fish and other domestic animals... And this flexible autonomous car concept would also work for that requirement...
However, for the workforce you mention, it is absolutely plausible that sharing of autonomous cars would be highly convenient for an agile, flexible workforce (exactly the kind of work-force you describe - including that heinous zero-hours lot). I would therefore tend to believe that it is plausible that 80% of the workforce could be served in Mike's Town of the future.
I'm genuinely not sure how this "car sharing" malarkey might be expected to work.
I mean, are we saying that I would buy a car - paying full price for it - and then be compelled to just let anybody make use of it when they want to?
What happens if I, the guy who paid money for the car, need it to take me to work at 8am and some nobber decided to use it to take them home from an all-night bender at 6am and threw-up all over the interior, just for good measure?
In fact, what happens if a big gang of heads all get together and decide to take a bunch of automated cars for some kind of automated joyride/race around the country, for the lulz?
Seems like we'd have to completely abolish the idea of privately-owned vehicles before this'd be viable (in which case, taxis are already a thing).
And, while we were at it, we'd probably have to eradicate the concept of theft too, in order to prevent these automated vehicles being stolen and stripped for parts or just plain vandalised - which is probably going to involve some interesting new invasions of our civil-rights.
Course, sorting out this stuff
might have happened before we get to a point where automated cars are truly viable on the roads.
What we're talking about is, however, a couple of extra steps down the road from EVs, though.
In the mean-time, even if a government created some kind of voluntary scheme (with associated tax benefits) to encourage car-sharing, I doubt it'd be especially useful - even if you could convince people to car-share instead of simply choosing to keep their car for their own use.
The main role for EVs is local journeys due to limited range and if you've got 4 people who all need to go 20 miles here, 30 miles there, 15 miles somewhere else, etc, you're quickly going to reach a point where the EVs range becomes the limiting factor.
Honestly, I think we're going about this "Alternative energy" thing all wrong.
I made a thread on this subject a couple of years ago.
Thing is, 50 years ago we
were all content to use public transport.
The thing that changed that was the availability of cheap cars, which brought private transport within the reach of normal people.
These days, EVs are taking that convenience back
out of the reach of normal people again due to high prices.
What we
should be doing is concentrating on cheap, modular, EV components that people can use to either buy an EV that's suitable for their needs ot even convert an IC car to 'leccy if they want to.
Forget the self-driving nonsense, the touch-screen infotainment systems and the wifi link to the factory.
The old duffer who just wants to do her shopping, or the guy who just wants to get to work, doesn't need all that stuff.
People like that would be much more likely to adopt EVs if they could just buy a cheap EV or take their IC car, bung an electric motor in it, along with a suitable battery pack, and carry on doing exactly what they already do.
Course, the only people who
lose from that are the car companies, who don't get to sell you a shiny new EV to replace the 40m perfectly good cars already driving around the UK.
I can't help thinking that has a lot to do with the government's advocacy for EVs.
Trouble is, it's no good trying to "boost the economy" by compelling people to buy new stuff when they simply don't have the money for it.