So, here's my take on the Uber-ification of cars:
1) Cars have a useful lifespan far longer than the car loan payment. This will continue to favor private car ownership until the maintenance and upkeep costs outweigh the marginal cost of calling an Uber (or whatever we'll have in the future). I'm not sure when that point will hit, or if it ever will. Electric cars are very low maintenance (battery packs are expensive, but that is fixable).
2) Cars have a significant delta between the high end and low end. You can easily see several hundred-thousand dollar cars driving on urban streets. They're a status/luxury symbol, and aspirational for a large number of people.
3) Cars-on-demand will, for some people, never replace the comfort of having a vehicle waiting for them in their garage/driveway. For the same reason hot desk-ing never caught on, it's nice to have a "home" where you can leave your usual creature comforts when on the road. I don't currently have a car (or car commute), but if I did, I can imagine it being a bit discomforting to have an unusual set of surroundings, lack of creature comforts (my gum in the cupholder, tissues in the center console, my phone already hooked up to bluetooth, etc.).
4) Busses, even if self-driving, are not going to replace dedicated vehicles (see the group shuttles from airports as to why).
It feels like the car as a status and convenience symbol is here to stay for the foreseeable future (certainly our lifetimes). And making cars for upper-middle/upper class folks is very profitable. Sure, Apple wouldn't make a $5000 car no more than they'd make a $50 mobile. But a $40k-100k car? I think they could hit that one out of the park.