I'm 29, married with two young kids. We're excited to ditch our vehicle and never look back.
Short of utopian sounding solutions like the basic wage, I'm really not sure how our economy will take care of people as we automate more and more formerly manual tasks.
I think it's possible we may see a time when most vehicles stay in the network, and rarely need to sit idle. That would be ideal certainly!
I wouldn't be surprised if car ownership becomes 0% by the time my kids grow up. Cars will essentially become like trains - owned and operated by companies trying to make a profit. You just pay for the ride or get a monthly pass.
We can only hope so. Think how much people work for a resource that sits idle 95% of the time. New vehicle sales this year are at ~17 million units a year, with the average price being ~$35K/USD/year. That's $595 billion/year being spent on something sitting around most of the time. Just think about how much less work people would have to do if they didn't need to own a car.
This isn't to say that pervasive tracking of individuals' whereabouts isn't a problem. I just think that self-driving cars aren't going to make the situation any worse than it is / will already be (exact timing is modulo your present jurisdiction).