Default is not a solution to repay a debt. You can choose to default, but you can't expect any credibility later. The message Varoufakis sent to Greeks was: "Let's just say we don't want to pay and everyone will forget about in a couple of years."
The solution he proposed to the EU was rejected and the next day was applied by the letter on Ukraine.
Plus being accused of talking macro-economics on a Eurogroup should be like accused of liking basketball at an NBA playoff game. But then again, if the room is full of politician, who don't understand the first thing about economics and just blindly execute, that's what happens.
The only way to get financing is by debt restructuring. It has happened time and again. You'd be amazed how many countries defaulted the last century. I think Germany defaulted twice.