What they neglect to consider is that for the vast majority of truecrypt users, the government will not investigate their computer at all. In this case, it is a better strategy not to use a hidden volume, since it is more work. And most people will always choose the easy way.
Actually, even if you don't want to use a hidden volume, according to game theory the correct solution is for the user to always have a second volume and for law enforcement to continue torturing the user until they divulge their second volume (or die)
