But then you’ll likely have a bunch of extra traffic created from the cars going to and from their owner to parking, rather than just to and from their destination. Or from the car just circling the block because the owner would rather not have to wait long for its return.
Right. You go to the opera, you order the car to drive around the block for two hours and then pick you up. Cost of gas is cheaper than parking and by definition, you're not affected by any traffic congestion caused as you're sitting watching your show. Sure, 1000 other people in the theater are also doing it, but that's not your problem.
30 minutes before the show is over, you order the car to wait in the "no stopping" zone in front of the theater for easy access. You exit the theater and find your car is tangled in a mess of traffic that takes 45 minutes to clear as most of the cars are double-parked and blocking traffic, waiting for their owners. For the duration of the show, no useful traffic has been able to move for a mile in any direction, as empty cars are just idling around and are content to wait, fully stopped.
There's a big limit on how bad it can be with Uber though because each Uber is currently driven by an actual person. That person costs money and places a natural limit on how many unutilized Ubers there will be.
With AVs, this limit no longer exists, and people will start using AVs for runs that currently are prohibitively expensive with care that require drivers.
