I don't get it. None of your points tell us why we would not charge for parking spots. But you seem to have realized that "cars.. are a bit meaningless in a city", that's the first step.

Right now, "free parking" is a tax on everyone actually living in the city. They pay more for living because prime space is given away for free to store heaps of steel on it. Moreover, building regulations require new projects to provide parking spots proportional to the number of units, even when many city dwellers no longer own a car. That drastically increases development costs in cities that are starved for housing.