Is there any city that's done that and has completely banned cars to replace with transit? I haven't seen any except in very small pedestrian-only districts.
But I've seen a lot of fighting in my city anytime any transit or biking project reduces road space dedicated to cars, even if just removing on-street parking.
>People are in cars.
All too often, a "person" is in a car, which is a pretty poor use of space.