No one here should realistically think that Waymo can solve the main transportation problem. It will just (partially) replace Uber, Lyft, and taxis. And it will have a better passenger experience and it will also be safer. It’s obvious that cars, autonomous or not, can’t replace rail, bicycles, and walking.
I think it could solve a lot of transportation problems though. In theory if driverless vehicles were ubiquitous you'd have no on-street parking, no commercial transport in the day (do it all at night), much less traffic (just wait until your slot; maybe with peak time pricing), fewer delays due to crashes, etc.
When nobody drives manually you could even do things like getting rid of traffic lights.