Earlier quoted context omitted.
The argument that counters this is that hailed rides will be cheaper than driving what you already have. You don't need to make a new purchase to switch. Even if you have a recent model sitting in the driveway, you may choose to save money by hailing a car rather than driving your own. I don't know if it'll play out like that, but the article is pretty convincing.
I don't think hailed rides can replace a daily commuter as easily as the author suggests. If everyone were to replace their daily driver by hailing a self driving EV, there would be massive surge pricing as most people would be commuting around the same time.
Commutes are predictable (people do the same exact trip at roughly the same time) so easy to optimize.
You can therefore pack more people in the same fleet during peak times than during non-peak times.
The second obvious step is to create additional fleet made from half-buses like the 12 seater for peak traffic, a better Chariot.