More roads just does not scale. Look at LA. Look at San Francisco. More capacity isn’t just going to magically appear.
Waymo is only going to increase overall utilization by reducing the marginal cost of running a car. They aren’t magic traffic-solving devices, they are traffic-adding like DoorDash and Uber have been.
It doesn't matter what you think scales.
If you don't design infrastructure based on what people want, they are going to do it anyway. And things will be extremely chaotic.
No amount of fees, fines, etc will change that.