Eliminate the driver and taxis become way cheaper (probably cheaper than owning a car). That means people like alkonaut here will be far more interested in just not owning their own car that sits idle except when they are personally driving it. Which reduces the amount of space we are spending on car storage.
Why do you think they will be cheaper? Get ready for surge pricing being the norm. If you don’t have a vehicle of your own, you’ll have no choice but to pay. That’s why investors are willing to pour untold billions into this, they expect a massive payoff.
I'm sure that investors will extract a nice sum of money, but it's their ability to outcompete taxis on price that will allow them to do that. Or to put it another way they don't need to extract $30,000/car/year^1 and competition means they won't be able to.
^1 what ddg tells me the average US taxi driver salary is.
Perhaps for some of the use cases there could be better utilization (meaning cheaper) taxi, e.g. a taxi picking up my kids for school could also pick up a few more.