They can only rely on bitcoin
they will not, many are only waiting to dump their coin when the price will be ready, what if they start buying bitcoin and then many early adopters or random big holders start to dump because of the bubble created by their buying and as a result a big crush after this?
too much risk for them, at 500 already there will be a huge dump, they can only lose money if they will buy bitcoin in mass
I don't think they can even afford to buy bitcoins, the whole debts started to take place because Greece was just unable to afford Euro, you think they can cope up with a currency which will multiply 55x times in price just as soon as Greece adopts it? I don't think there is a happy ending for Greece regardless of the presence of bitcoin or any other crypto currency.