Don't forget the euro is still stronger than the US dollar
It's really up to the Greek at this point. Either they start realising they can't just have it all without giving a bit too, or they don't and choose to go on without Europe. In the latter case, we all have problems, but it would be interesting to see what happens when Greece goes bankrupt. It might not be such a bad thing: Greece disbands, sheds all its debts and starts over new. In a chain reaction most other European countries will go bankrupt, shedding all their debts and starting over with a new government. All banks will go bankrupt, and everyone will loose all their savings.
This might result in a lot of non-European banks and countries going bankrupt.
In the end, I'm not sure that's really a bad thing. Just reset the global economy and start over. For the majority of the world population, that's actually a good thing. Only those with lots of money have lots to loose.
Personally, I'm in favour of hyperinflation, since I have more debts than savings at the moment.
An alternative is to sell Greece to China
Which is actually the biggest worry: the collapse of Europe on its own is not really a problem, but we have to avoid that the Chinese (or others) buy our land and infrastructure.