I'm not sure why you think waymo would fight against that. People getting rid of their own cars for daily use will increase how often a service like waymo is used for occasional usage. In the long run it would be a win for waymo. Not many people are taking taxis on a daily basis in New York for normal driving, they buy a car if they need to do that because even with the parking bill they will still come out ahead. And once they have their own car they feel like they need to get some use out of it.