Communities within Greece are coming together and forming barter systems because they know the Euro is becoming unstable. Greeks are learning how to engage in commerce with each other, without the use of fiat currency controlled by central banks. In other words, they are rediscovering what money really is, and they are trading with each other in ways that cannot be controlled, manipulated, squandered, inflated away and generally ruined by corrupt bankers and the politicians that enable them. Farmers will still grow food, mechanics will still fix cars, people will still make things and exchange them with each other. No banker, no politician can stop that by destroying one medium of exchange. People will find or create another medium of exchange.
This sounds a bit idyllic but when confronted with no other options it is definitely appealing. Certainly no one wants to be left holding worthless currency, and in my neighborhood we already trade services depending on our skills (roofer, computer guy, etc.) It's just a larger version of that. Works out better for us since there's no taxes on it either. Keep the pols out of it.