That's not a problem, that's the entire point. The PIIGS (Portugal, Ireland, Italy, Greece, Spain) switch to national currencies, print money to pay their debt,

That's not a problem, that's the entire point. The PIIGS (Portugal, Ireland, Italy, Greece, Spain) switch to national currencies, print money to pay their debt, and suffer the effects of inflation. That's precisely the mechanism by which a breakup would 'solve' the euro crisis.