I've been adding more about the importance of having a frontier to the revised book (Polycentric order also has a post about this).  Here is one of the new sections:

Consider people who:

1. Are unhappy with the current state of society.
2. Have a specific vision of what a better society for them would look like.
3. Are interested in building their lives around that vision

I'm expanding the FAQ to answer some of the comments made on the Marginal Revolution post, and I decide to start with a couple answers I should have written up long ago, because they are so frequently needed:

(Another new snippet from the book beta, inspired by a lunch conversation today.)

When talking about how we'd like to revolutionize the governing industry, we used the metaphor that we'd like government to be more like the internet industry than operating systems.  One of the properties of the internet is that it is based on a variety of open standards which allow many diverse programs, companies, machines, and people to interoperate.  We'd like seasteads to have this property also.

(This is a small new section for the book beta.  I will frequently post such sections as writing progress on the book continues.  Comments welcome.)

(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: