The fact that a sizeable minority of libertarians are anarchists should cast doubt on a model that places them on opposite ends of a spectrum. Also, I think your suggestion that the top right is represents feudalism (if true) would actually make the model even worse, since feudalism is horribly misunderstood by the general public (even more so than fascism, in my opinion).
The fact that a sizeable minority of libertarians are anarchists should cast doubt on a model that places them on opposite ends of a spectrum.
Brin is probably using "anarchist" to mean the movement that goes by that name, and not merely the adjective meaning "anti-state".
This is a great article at Aeon magazine. The author argues that the new ideological dichotomy is going to be between people who have great faith in technology and human innovation (Up) and the people who believe that humans are much more tied to their biology and the Earth (Down).
LW of course is a very Up community.