I'd like to hear what the Slashdot economists think should be done about Greece.
Nothing at all. Greece is like Venezuela, but without the oil. There's nothing to be done until they decide to stop their social experiment. The world shouldn't subsidize that.
What's the real downside? Migrants? Western Europe is already experienced at stopping poor people on their borders, and it's not like Greece has a direct migration path. A Greek that wants to sneak into Europe has to cross the land of the vodka people, or try to swim to the south-east part of Italy. That's quite a convenient buffer, just like Mexico is a convenient buffer for the USA.
Europe managed to survive two world wars, plenty of civil wars, the plague, three Inquisitions, etc. I think they will survive the bankruptcy of a country that hasn't played a significant role in history since before the first edition of the bible.