If I wanted to use Uber to commute to work five days a week, the average ride even with UberPool would be around $19 one way. Assuming I go somewhere else that's of comparable cost just once a week (in practice, I tend to go out for dinner several times a week and go fairly long distances on weekends, but never mind), that's 26 days a month spending ~$37 per day, for nearly $1000 a month. My car payments, insurance, and fuel per month are almost certainly hundreds less than that.

"Why own a car when you can just Uber" makes sense for people who live in areas where they don't have to (and don't want to) drive very much, but I think the assumption that most people fall into that group is pretty shaky. I think it's probable this will change over time, but that time span is almost certainly going to be decades, not a few years.

a very San Francisco way of thinking which would already break down in LA, let alone other places with long driving distances and lower parking costs than SF (and hence a wayyyyyy different value proposition between owning a car and ubering)