The giant spot of land could be in a much less convenient (= valuable) location if the car can take itself to and from there.
So the incentive will be to put/drive cars very close to where people are.
That whole "cars will be stored at the periphery" is propaganda.
Back in the PRT days we simply planned to store 1-2 vehicles in-station waiting for walk-ups, and if a drop-off comes in they just push out the waiting vehicles and they circle back. The efficiency remains crazy supportive of that model vs empty buses or trains.
My hope is that the bottom-of-the-barrel US approach isn't shoved down the throats of everyone else just when we're finally managing to rebuild cities for people, not for cars.