It wouldn't necessarily be as impossible for Greece to do a quick exit as everyone seems to think. Greece produces its own Euro notes which can be differentiated based on the serial number and Euro coins which have their own obverse. So a separate Greek Euro could be quickly implemented. It would cause Eurozone-wide pain for those dealing with physical money, but it would be reminiscent of what happened with the Papal States and the Latin Monetary Union in the 19th century.
Of all the absurd suggestions so far "five year sabbatical" is the most ridiculous.
If Greece is out, it's hard to see how it can get back 'in'.
Meeting the Maastricht criteria in five years is probably impossible, but if the devaluation of the Greek Euro is done right, returning to the Eurozone Euro within ten could probably be done. The main obstacle would likely be the interest rate requirement.
