There is probably some market equilibrium where they could reasonably provide <5 minute pickups for waymo users that would both cover the cost of the automobile and still be less than the price of an uber today.
I do worry in general about what the enshittification of Waymo will look like, though.
The story they told is that they were unable to get a ride. That’s not enshittification, that’s simply scammers on the platform not doing their job.
That won’t happen with robots.
They might raise the prices, or clean the cars less frequently, but if it shows up and runs the program, it won’t ever get worse than that.
But yes, I originally switched to them because Bay Area cabs just will not pick you up if they don't feel like it.