Greece is broken beyond help. It is unfortunate, but nobody can fix their own mess except Greek alone. They need to figure out a way how to make their economy growing. However, they cornered themselves into the position, and their elective leadership isolate Greece from rest of Europe. They are without ally. I expect total disintegration of their economy, because their banking system had collapsed, and they would need at least 90 billions to restart the economy, which is 1% of GDP of EU. However, ECB would need to get all other 18 members to vote on it unanimously, which they wont. All of Eastern EU member are deeply against Greece, and Slovakia called for expulsion of them from EU.
Greece needs to reform and modernize their economy to be strong and enable generate extensive export. Greek export 1/3 of good what is generated by much smaller Slovakia. Czech Republic with the same population size, export 6x more. Yet, all these countries have lower income and lower per capita output than Greece. Something went horrible wrong in the past decade in the Greek economy. The leadership that is responsible for it should be jailed. Austerity only deepened the misery and very little was done in reforming the system.
With collapsing system, Greece may experience a military junta, and leave NATO and EU all together.