I'm afraid you're wrong about wanting "nothing to replace it"
And Ron Paul isn't
my Poster boy. I'm not a political Libertarian, I'm an agorist. That means I want to build the replacement system right now, within the shell of the old failing one, so that when it crumbles (oh, and it will, on that, I think we can agree), the new way is there to take up the slack.
A few links that may help you understand my position:
http://freekeene.com/files/marketforliberty.pdfhttps://dl.dropbox.com/u/146411/BookClub/NLM.epubhttp://agorism.info/But before you read those, I want to ask you, What is it about human nature that you believe libertarianism would need to change?
This system will crumble. What takes its place will probably the same thing that always does. Feudalism. It may be a more technological feudalism, but violence will be at its core.
I didn't define human nature. I said behaviorists are working on that. How do you fix a problem when you can't even define it?