25 years from now, if half the cars are then capable of autonomous nav-and-park, we could convert some of the excess parking lots to buildings. (Any lot large enough to have “aisles” will also be large enough to build on.)
It also affects what the ground floor of buildings looks like - you can't have ten ground floor pedestrian exits or bike parking in the courtyard if the courtyard is on the third floor.
25+ years from now, if it’s more economical to use for housing, knock it down and build high-density housing.