See, the problem with reversing the pyramid, primarily for societies addicted to cars, is that even if all infrastructure was changed to make things the most safe for cyclists and pedestrians, the damage to the mind of the average citizen has to considered as well. The lack of exercise, the lack of the ability to consider one's individual contribution to environmental pollution and the socioeconomic relationship people have with their private vehicles all have to be dealt as well in order for the outside world to need for such change.