Reminds me of the "Archipelago" idea Scott Alexander used to play with[0] - the concept that takes the assumption that people, given freedom of association, eventually form into groups they feel good in, and follows it to a logical extreme. You'd have a word formed into "countries" and a central body that basically enforces two rules: 1) no aggressive actions of one country against another, and 2) freedom of movement for all - so if you don't like your group, you can migrate freely to a different one. There are some caveats in that thought experiment, but it does strongly resemble what you said - that "what people want is for it to be easy to choose which sort of government they live under".

[0] - http://slatestarcodex.com/2014/06/07/archipelago-and-atomic-...