The only real option they have is to be first off the boat. Print their own currency, sudden announcement that they will leave the euro.
Apparently that isn't an option as there is no constitutional way anyone can exit the Eurozone. If there was; number one would be to punt the Greeks, deflate their dollar and start the country again as with Argentina.
You would find if Germany tried to exit they would be taken to the European High Court. Ultimately they are a sovereign nation and can do what ever they want but they would want to have the military ready to backup any form of exodus of Europe as it will get ugly.