When a "normal" country gets into a financial crisis, the normal way to solve it is by devaluing the currency. Making the own currency less valued means that foregign products will be expensive. So more of the money will stay in the country. And it will be cheap for other countries to buy products from that country, so foreign money will flow to country.

When having a common currency, you can't suddenly devalue the currency for a single country. So the alternative then is to decrease the salary of everyone in the country giving the same effect. Own products will be cheaper so will sell more on export. Foreign products will be more expensive, so own money will stay.

Problem is that it isn't a politically easy solution to tell everyone that they have to get a reduced salary. So politicians try alternatives - or try to do nothing at all. And the wheel of bad fortunes will spin faster and faster. The problem here is to get the total amount of greek money to get in balance with the perceived value of all products in Greece. One way is to give Greece huge amounts of money. But other countries don't want to "buy" a significant percentage of a country (without getting any profit from it) just because that country have not been run properly.

So the Greece problem will not go away until one or more groups of people have decided, accepted, realized (insert whatever suitable word here) that they have to sacrifice a lot to get amount of money in balance with perceived value of all goods, companies, ...

Have you seen many politician sacrificing their career (and maybe their life) by really, really telling the people that no one will come and buy their country. Or invest money without expecting a lot back. That foreign help will require huge national sacrifices too.