Autonomous cars could allow space currently devoted to idle car storage to be reused for denser development patterns, which would reduce the need for car-based transport in the first place.
The paragraphs under the "Slowing Down" heading kind of imply that they think the argument also applies in an urban environment. It's incredibly frustrating and infuriating to read such an utterly anti-bike anti-walker policy get advocated like this.
Already starting to happening. I know a kid in high school who's annoyed by his parents insisting that he learns to drive. Some of that is because he believe the tech is going to get good enough by the time he gets out of college, the rest is because I've set an example that it's possible to achieve a car-free lifestyle already if you make it a major priority.