I'm missing something...
Here's the interesting thing about Uber and Lyft being a part of this. A big part of their brand -- insofar as it makes them "friendlier," particularly in areas that have a lot of hostility to Uber in favor of old-fashioned taxi drivers -- is that they provide jobs to people who really need extra money. They even have TV/video spots focused on this, and how great it is to work/drive for Uber.
Plus there's the fact that Uber and Lyft's whole business models are that of a shared economy that keeps their costs low because they don't have to own a single vehicle themselves.
So how do self-driving cars help them exactly? What's the bigger picture here that I'm missing?