It will be a sad world if people ever have to rely on Uber and Lyft to get from place to place.
I suspect that you are older than a Millenial and do not live in a dense urban area. (Personally, I'm older than a Millenial, I don't live in a dense area, and I very much treasure owning my own car.)
When I was a teen I was just counting the days until I got a permit to be able to drive a car; now Millenials are increasingly not bothering to get driver's license and insurance, and taking bus/Uber/Lyft when they want to go somewhere.
And there are people who live in dense urban areas who would find it a hassle to park a car, and prefer not to own a car there. More, there are cities that are actively trying to reduce the number of cars on their roads.
Tesla has not demonstrated that the sensors they are shipping will be able to handle all cases.
Okay, we get it, you're skeptical of the full self-driving features.
Will they be aimed low enough to stop to allow a rabbit to cross the road safely or are we just running over animals now? Will they scan the contour of the road so they can drive properly through ice ruts or around deep potholes? I didn't think they had that kind of tech yet.
Frankly I don't know the answers to these questions, but if Tesla thinks their current sensor tech is sufficient for full self-driving, my guess is they have at least thought of each of these things.
My guess, and it is just a guess, is that the ultrasonic sensors would be used to watch for ice ruts and potholes; that the testing program has already included people driving the test cars on roads with ice ruts and potholes; and the forward radar would likely do a better job of spotting a rabbit than a tired human at night. I don't think anyone is claiming that the self-driving features would completely eliminate all road kills, but equally I doubt self-driving cars will be worse than humans.