Concerning Greece paying up, you have no choice: they can't. Read my lips: They have no money. The EU proposal was simply not realistic. Any proposal that contains the idea that Greece would be paying up, is a dead-end, non-starter.

Concerning Greece remaining in the EU and the Euro, you do have a choice. It would be short-sighted to expel Greece. You see, everybody just has to learn their lesson. In the future, don't let your commercial banks buy too much Greek debt paper, because you will end up paying instead. It takes two to tango. There's no point in blaming just one side of the equation. The other side is responsible too.