It's also about enabling Uber-style intelligent carpooling so that you can save energy while still maintaining similar times to driving, especially in places with poor or non-existent public transportation.
It's also about reducing the number of cars in the world. You probably use your car for less than 5% of your life. Most of the time it just sits there taking up space. Why do you need to own it? Imagine a world where you didn't need to own, maintain, or park. We can reclaim parking lots and plant trees, build housing, or other things. We can also reclaim a lot of our time spent in traffic jams or looking for parking and do something more useful with it.
It's also about enabling people who are unfit to drive to have a better quality of life. What if you've had a little to drink? What if you're down with a fever and a headache and can't concentrate on the road? What if you're sleepy? What if you are prone to seizures? What if you're blind, deaf, have poor motor skills? What if you're a visitor to an area without a public transportation system and not confident renting a car and driving?