Compact communities don't have to involve large populations. There are already small and medium-sized villages in Europe that have successfully converted to 10

Compact communities don't have to involve large populations. There are already small and medium-sized villages in Europe that have successfully converted to 100% car-free walkable spaces, and it isn't inconceivable for many existing US suburbs. You just have to move away from this design philosophy focused on strictly separating residential and commercial zones.