I thought about this as well. The dsytopian world I think will exist in the future where the Waymo is priced higher and people will want to take it more, over a cheaper Uber. Precisely because the human driver is removed from the equation.
So yes, I think they will be able to turn a profit by charging more for the experience. Which is a humanless car.
At least in my area, Waymos are always more expensive than Ubers.
So, uh, you don't really tip your Uber drivers much then do you?
Right now, Tuesday 3pm, Waymo will cost me 13.76 cross town. UberX 10.95, Lyft 11.95. If I don't tip Lyft/Uber they'll be cheaper but I definitely don't tip the Waymo.