TL;DR Seasteading will allow for the decentralizing of nations the same way Bitcoin decentralizes currency.
btc decentralises nation states - what is for example the USG without the US$? and what is the USA without the USG? Angry people with guns.and boats. any ship or island when that shtf will be a sitting target for pirates.
Pirates sound scary!
https://www.youtube.com/watch?v=DFxK7o74-kY
Could even make a sport out of them...target practice.