You don't need outward collective action, really. We remade our cities in favor of cars, mostly through applying changes to engineering standards. We could do

You don't need outward collective action, really. We remade our cities in favor of cars, mostly through applying changes to engineering standards. We could do it again, but the current engineering establishment doesn't want to change in many cases. (They had an easier time applying their standards, because by and large no codified standards existed before them.)