I think we should expect safety drivers to be around for a long time. Companies are going to be very conservative in their removal because there is little incentive for them to remove them until they are sure it’s going to be worth it. The ROI long term is so clear, and that makes it easy to be patient.
This notion that no one has an incentive to get drivers out from behind a steering wheel is wrong. Most of the cost of an Uber today is the driver, especially when you refactor out the usurious margins Uber wants, and lease/insurance/permitting associated with a human driver. Car fleets have an enormous incentive to get as autonomous as possible as fast as possible.