I don't think the ECB (European Central Bank) (nor the EU) would be too happy if Greece were to ever break up and part their own way, likely Greece would join the BRICS nations which threatens the hegemony of both the Euro and the Dollar. Note the fact that it was Western elites who created the idea of a 'European Union' to exploit European nations and create more (economic) alliances with the US way back in the day (confirmed by Wikileaks' dynbase documents that were leaked).
We now see other nations, like Ireland and Portugal, that are very unstable and may follow the same fate as Greece. Germany being the ONLY nation that can keep up economically in the EU. The worst thing for the ECB and their Euro hegemony would be to see a breakup of PIIGS nations from the EU. This could also further undermine the US dollar too if those nations were to set up alternative financial transactions and trade with competing BRICS nations.
Every crisis we now see around the world has to do with economics and countries struggling to maintain financial control. As for nations like Greece who think they live under 'democracy', that has proven to be delusional, they do not have any democracy. Their referendums do not matter, as was already proven, the EU still has a very powerful stranglehold (likely not just financial - but military as well). My prediction is we will soon see a multi-polar economic system, where Eurasia (the CIS nations) and the new EEU (Eurasian Economic Union) will compete with the current IMF SDR standard (meaning they will do trade outside the Euro and Dollar). This is already causing countries to 'dump' (liquidate) treasuries from Western nations while investing in their own reserves for alternative trade.
The goal of the Federal Reserve / ECB / IMF was to maintain unipolar hegemony over the rest of the world, exploit economic crises to consolidate resources for their own interests HOWEVER other nations have caught on to this scheme and you can bet you're ass that it will end within the next decade (unless there is another World War to prevent it).