The micro state idea is problematic. Most modern examples are effectively parasites on the surrounding nations. Singapore and Lichtenstein do tax evasion and money laundering for a living. They also skim talented people off other countries.

The big problem with the micro state idea is military power. Much of the stability apparent in the modern world is really down to the military might of regional powers. Leaving libertarian fantasy land of peacefully trading small states, what seems more probable and historically accurate is feuding for supremacy by any means.

Despite all the computer oriented techno wankery around here, the biggest value of the continental United States is still the Mississippi watershed. Anyone who controls it will be a world power. You can't realistically break it up into stable micro states.