It's just lifting a requirement, for know. Presumably, there are currently cases where you have to build a parking lot even though it's the headquarters for Fundamentalist Cyclists International and situated right next to public transport.

After that, it's chicken-and-egg more than cart-and-whores. With surface parking lots taking up easily half the space in many US business districts, eliminating them could double density and thereby cut average distances in half, making other modes of transportation much more feasible.

Essentially, the US at one point chose cars as the dominant mode of transportation and got trapped in that decision. Anybody who has seen alternatives knows this is a tremendous burden on quality of life, yet any change will, in the short term, also hurt in different ways.