The best decision would be to completely forbid individual transport. Now the common space dedicated to streets is for who can pay extra. Forbid individual transport and create some parks and pedestrian streets.
These threads tend to devolve into, "Americans are so unsophisticated everyone else in the world is banning cars and turning downtown into walkable utopia" but what they really mean by rest of the world is a few crowded European cities. If you look at all the new rich mega cities built in the Middle East and East Asia cars continue to exist alongside good public transit as aspirational status icons and the preferred means of transit for people who can afford them. Cars are never going away.
There are plenty of cars in Paris and London. It just feels as though people walking are a priority more than they are in NYC. Cars feel compelled more often outside of NYC, where they also block intersections and park next to crosswalks and block visibility.