There is no looming financial crisis for the U.S. Government, the scorekeeper for the U.S. dollar. The U.S. Government can't run out of dollars, and it is not dependent on taxing or borrowing to be able to spend.
Greece will restore national sovereignty, and regain control of the process of full compliance with the general EU requirements for all member nations, only when it restores its financial independence.
Europe's political structure is also suspended between two stable formations: the federated nation state and the international alliance. This in-between structure is called a confederacy, and it is something that was tried and which failed in North America.
Greece and its people take responsibility for their own failings and have launched an unprecedented effort to make them right. We will not, however, be held responsible for a global economic crisis, the roots of which lie elsewhere.