Like most Keynesians, in the end, Paul Krugman is a one-trick pony who always recommends inflation as the answer to economic problems. (After all, he DID say in The Return of Depression Economics that inflation could provide a "free lunch" during economic downturns. In other words, the printing press negates the Law of Opportunity Cost.)
So, I see that Krugman now is giving the "Vietnam Strategy" to the Europeans: in order to "save" the euro, you must destroy it -- via inflation. Furthermore, we are supposed to think that had the German government in 1930 embarked on a policy of inflation, that it would have "saved" the country. Somehow, I doubt it.
How should the Europeans do it? Krugman already has set out a strategy that marks the way in which the European Central Bank would purchase the short-term debt of countries like Ireland, Portugal, Spain and Greece and hope that in the future, these countries will get their fiscal house in order. (Even Krugman knows that Greece cannot and won't do it, given Greek policies and its bloated government sector. Nonetheless, he believes that maybe the European Central Bank can inflate Greece's problems away, too.)
However, Krugman does not even contemplate any realistic outcomes of his strategy. If the ECB simply acts as the Big Sugar Daddy for countries by purchasing government bonds wily-nily, what is to keep everyone else from joining the Free Lunch? Sure, the European Parliament can enact policies that supposedly will limit this foolishness, but it is doubtful that once the shower of goodies starts, that anyone will hold to fiscal discipline.
In the end, this is a strategy that would inflate the euro out of existence. Now, that might be "good" for the dollar, given that investors around the world holding money are looking for safe havens. But the dollar sucks, too, thanks to the money-pumping strategy of the Obama administration.
So, in the end we are left with blizzards of paper money. But never fear, says Krugman. After all, everyone from Princeton and Washington knows that paper is more valuable than gold because paper is managed by Really Smart People Who Know More Than Everyone Else.