Alex Tabarrok writes:

Competitive law appears to increase efficiency but it's less clear that competition among governments gives rise to a libertarian world.  Homeowner associations, for example, often impose stricter zoning regulations than cities.  You could say that the system as a whole is more libertarian, but no one lives in the system as a whole.

(this will go into the book beta, in the Review section)

Here is a comment on a floating city post somewhere on the internet that represents, to me, exactly what is not needed to advance the movement: