Is a Libertarian society a pipedream?

I really enjoy some of the discussion and questions that takes place on the Wall Street Journal discussion forum. At times I wish I had more time to participate, but for now I enjoy reading many of the discussions. This recent one where the question of "Is a Libertarian society a pipedream?" is a recommended one. As always there are some great answers and some not so great answers. One part of a comment that I'm not sure I agree with but really made me stop and think:

"In other words, libertarianism works only in books, on lifeboats or among people stranded somewhere for a length of time not to exceed six months. After that, human nature takes over and anarchy/totalitarianism/starvation and death take over."