Walter, this interpretation of Jesus as an anarchist surfaces off and on through the history of the Church. The Anabaptists of the 16th century, for example, took a stance of radical separation from everything having to do with the State. I discuss this in the lecture on the Swiss Reformation in the Western Civilization Since 1500 series.
I think this commentary you link is correct to the extent that as more and more people behave the way Jesus taught them to, the perceived need for the State shrinks. I also think it would be a mistake to view Jesus’ ministry or specific statements such as that in John 18:36 as being primarily political.