The problem is that Waymos can't replace cars (or even Ubers!) since they depend on human oversight and problem-solving. Even at a 20:1 ratio it is not feasible for autonomous vehicles to employ 10m people to account for every American on the road.
[1] Edit - I meant 5% not half, I was on the train and very frustrated with these comments. (not yours, though it seems bad faith to say "not remote driving" when I said "problem solving." The problem has always been the 1-5% of driving which truly requires sophisticated intelligence, that's why the oversight is there.)
Every Lyft driver I've spoken to drives because a) they like driving b) they like choosing their own hours and c) they don't want a boss. Telling them to go into an office for an 8 hour shift with a manager is not gonna work, they will find something more appealing. It's a different kind of employee. (I would enjoy that line of work but I would hate to drive for Uber, way too stressful.)
I emphasized that Waymo staff does not drive vehicles remotely, because this persists as a common misconception.