I am a ... fan ... of social ecology etc. But I feel such theories are difficult to apply in today's large-scale politics. Even the path to trying out any such theories in practice probably starts with trying smaller changes like liquid democracy (that is already proven in the corporate shareholder world).
These theories might go through massive changes if they meet reality. Remnants of past "experiments", say the basis of Liedloff's continuum concept, are not quite as neat as these untested theories.
The biggest motivator for cars and wide roads are weekend getaways; there are good options for commute and long-distance travel. Maybe, if you ban private car purchases and have good rail connectivity, people'd get by on rentals.