How does it matter if they pay them next week? It's meaningless. The bigger question is whether they can get a deal done.
I think 2016 will be the year that both Greece and then Italy restructure their debts. They are looking to complete their first QE program in March 2016. Defaults will happen after that and another QE program will be launched in H2 2016.
Greece is now very easy to deal with since almost all the debt is held by the EU. They just need a little more time to clean up the banks.
The world will give in to Greece. Europe under extreme pressure from the US and China to resolve this. Giving another 1B Euros to Greece makes zero difference anyway.
Italy is doomed, nothing will save it. Spain and Portugal are borderline. They will all have to default at some point. The EU needs some more time to prepare for the Italian default by cleaning up the EU banking system from Italian paper. That's what QE is for.
The solution was always a clean default. They just need more time for it.
They don't care right now. They are too scared of the markets. All they want is to kick the can. The difference between the Greek proposal and the EU proposal was maybe 100M Euros. They won't break up the Euro over that.
Tsipras called their bluff. Now it's time to capitulate. Kick the can for a few more months and get through the summer.
It won't be nukes, it will be a gas pipeline and perhaps a port in the Mediterranean to replace the Syrian port they used.