I saw them last year when I was in SF. IMO, the future of Waymo is for trains and buses or special fixed routes. There's going to be too much competition in the driverless car scene IMO. People can buy their own self driving vehicles and maybe Turo/Uber rent out their self driving vehicle when they don't need it. Waymo might get squeezed out of the taxi scene.
Now if Waymo creates a subsidiary named Delamain for premium taxi... that's a slightly different story. But they gotta add stuff like defense and crowd control and stuff
Or just "discretely" add a driver like the autopilot they had in the movie Airplane!