No one is taking that seriously. The general reaction to the "threat" was laughter. But it just happened to coincide with one of the fantasies of the far right that the world is going to "abandon the dollar as the world's reserve currency," which is going to send the U.S. into a hyperinflationary spiral, which will pave the way for America to finally embrace Ron Paul as its lord and savior, as he delivers the death blow to the poor and middle class.
Seriously, it's wacky, but IMO, you need that background to understand how anyone could think that the threat is plausible. And even non-nuts are not appreciating the extent to which something that would actually be positive. If ben had bothered to work through the math, he'd see that the "worst-case" scenario with regard to inflation is that it would bump up slightly to the point where it would accelerate the reduction in unemployment (as the U.S. has been battling excessively low inflation recently--not the same extent as Europe, which has been devastated by it, but it's still been a drag on the recovery).