Once the Greeks tell the EU where to stuff it's euro and tell the banks they can whistle for their money, they'll go back to the drachma - which will be devalued in relation to the euro, the pound, and the dollar. They'll also be free of the straitjacket of EU red tape and legislation - which have piled cost after cost onto small, family run businesses not just in Greece but right across Europe
The effect will be to make holidays in Greece much cheaper (the way they used to be before the euro!), it'll make Greek agricultural products such as olive oils and feta cheese much cheaper when sold abroad, and it'll mean that Greek people will tend to buy domestically produced products and support Greek jobs (because imported goods from abroad will be relatively more expensive).
Nearly 50% of Greeks work in the tourist and shipping industries, another 22% in agriculture. So if they tell the EU to get stuffed the Greeks will see a big increase in the profitability of the sectors of their economy which employ nearly 3/4 of their population - plus, their domestic industries will get a boost from an economic incentive to "buy Greek".
If you're Greek, what's not to like about that!!!!