If you're already inclined towards isolation, like I am sometimes, driverless taxies will help with that. But if you're inclined towards going out and doing things, which I also am sometimes, there are few incentives more alluring than a fast and cheap way to get from point A to point B. If labor and gasoline are removed from the equation there's no reason rides can't be ridiculously cheap, and spending $20 on a round trip instead of $80 lowers one of the biggest barriers for going out (at least in urban areas and/or when drinking/drugs are involved).