Inflating Away the Debt

Tyler Cowen points today to John Hussman saying something that's been in the back of my mind for a long time but never quite made it onto the blog:

Here in the U.S., [debt held by the public] amounts to about 60% of GDP and rising, due to recent budget deficits of about 10% of GDP annually. This is presently manageable since so much of that debt is of short-maturity and is being financed at very low interest rates.

....Still, it's precisely that short average maturity that makes the debt problematic from a long-run perspective, because it can't be inflated away easily. In the event of sustained inflation, the debt would have to be constantly refinanced at higher and higher yields. Contrary to the assertion that the U.S. can easily inflate its debts away, it is clear that sustained inflation would create enormous risks to our long-run fiscal condition by driving interest costs to an intolerable share of revenues. At that point, any shortfall in GDP growth or government revenues would result in a rapid spike in debt-to-GDP (as Greece and other peripheral European nations are experiencing now). Prior to embarking on an inflationary course, the first thing a government would want to do is dramatically lengthen the maturity of its debts.

This is true, isn't it? I keep hearing repeatedly, from tea partiers and assorted tea party leaners, that the real danger we're running isn't that the United States will literally default on its debt in the future, but that it will try to inflate away its debt. Sort of a soft default, if you will.

But that's not even possible, is it? The vast bulk of U.S. debt matures in three years or less, which means that a bout of inflation would simply raise the cost of borrowing. Virtually all debt holders would roll over their holdings long before inflation had any serious effect on them and the government would gain nothing. On an inflation-adjusted basis, the new debt issued would be about as expensive as the old debt.

So where does this whole "inflating away the debt" meme come from? Is it just the gold bugs, or is it coming from somewhere else too? What's the deal?