Reminds me of

http://opensourceecology.org/wiki/Marcin_Jakubowski and
http://galtsgulchchile.com

I believe if cryptocurrencies continue to grow exponentially there will be enough wealth to contribute back. Building cities themselves sounds pretty utopian, though. If a person or a group of people really wants to make things happen it takes a lot of vision to attract talent, capital, .... it's more realistic to think about a kind of resort like GaltsGulch.