It's not the first time a referendum in the EU hasn't meant anything. https://en.wikipedia.org/wiki/Twenty-eighth_Amendment_of_the_Constitution_Bill_2008_%28Ireland%29
Referendums and to some degree voting in general only exists because they can lend legitimacy to policy decisions. And if they don't? Time for "realpolitik". Financial realities, you see. And it's not just the EU The way I read the whole ting, Tsirpas and Varoufakis knew that the EU had them by the balls. It was either "accept being colonialized" or "crash". But they couldn't accept the conditions since they got voted into office on a promise of putting an end to the exploitation of the Greek people. They were hoping that the Greek would be scared enought to vote "Yes" to the EU plans. That way, they could have accepted the terms and justified it with "the people have spoken". But the Greeks said "Oxi". A day later, Varoufakis resigns. He knew what was comming.
Good point about the timing of Varoufakis' resignation. >they couldn't accept the conditions since they got voted into office on a promise of putting an end to the exploitation of the Greek people I really wonder what they were thinking back in Dec/Jan. They campaigned on ending austerity, the people voted "No", months later supporting their campaign promises, and when push came to shove they folded immediately. What were they hoping would happen or what were they hoping to accomplish? I can't see how this won't end the government. The next election in Greece is going to be...interesting.