There will ultimately be the day of reckoning. Tsipras has actually played his game pretty well by making the Greek population seem like the victims after what four or five years of EU and ECB imposed austerity. The end game is nigh and might well end up with the EU/ECB/IMF troika opting for a carrot and stick approach that entails the reality that the debts have to be resolved with major write-downs -- that's just arithmetic and history -- for those of you who recall the Latin America crisis of the 80s to 90s and even going back to Germany in the 50s.
The commercial banks that have lent Greek tons of money will have to take responsibility for assuming bad risk -- a variant of the "moral hazard" argument that banks make assuming that if things turn awry they will be bailed out (by the ECB perhaps?). Based on my recollections from my student days, there was that mooted international debt facility agency wherein commercial banks were supposed to agree to a major reduction to the contractual debt-servicing burden of the debtor country, in return for the remaining debt being guaranteed by the debt facility agency -- or something to that effect. Secondly, there is just no way that the banks will get face value for what Greece owes. In the event, the banks would have to opt for less than face value, that is, market value. What is the discount value of the Greek debt today, anyone on Nipate? Of this, they could then figure how much Greek interest payments and principal would be rescheduled at that market rate.
As for the Greek government dealings with the sovereigns and multilateral lenders, say, the IMF, I read a statement attributed to MD Lagarde stating that the IMF might be willing to accept a situation where there is a restructuring of Greek debt or rescheduling of payments.
Lastly, Greek Prime Minister Tsipras will have to bite the bullet and do what Moi did in Kenya -- 1999-2001 -- by undertaking overdue reforms and adjustments. These will entail structural reforms such as making the labor markets more flexible, sealing tax loophole and enforcing tax payments by all Greeks -- many of whom evade filing their taxes accurately, and also changing the pension system so that people pay into what they eventually receive -- a self-sufficient system-- as opposed to the current situation where it depends on subsidies from the government even as it is untenable because of demographic changes in an aging country.