I don't like Elon. But, I have to hand it to him: giving this away for free to everyone for a month is a great idea, giving a preview of this tech.
I would still prefer mass transit in America. BUT that said, as things are, self-driving cars will revolutionize everything. A large part of the danger of driving is all the people who don't pay attention when they drive. Distracted, drunk, or just bad judgement: self-driving cars eliminate all of this!
Now the bad side is taxi drivers and truck drivers will all lose their jobs. That's unfortunate, but hopefully the overwhelming positive effects will offset that.
Did you see this: