http://www.forbes.com/sites/harrybinswanger/2013/06/04/dont-be-silly-the-entitlement-state-wont-allow-bitcoin/Brings up some valid concerns, but ends up in just another circular goldbug argument. If free market is allowed to choose money, it must be gold because it's always been like this. Well, that's wrong because there were money BEFORE gold: cattle, cowrie shells to name just a few. So, at some point gold displaced those earlier money and came to dominate because it was a better fit for monetary function.
Since Bitcoin is better than gold in pretty much any aspect, there is no reason why Bitcoin could not outcompete gold and become a dominant form of money in a free market competition.