P.S. The Germans may, at some point, prefer to bail out their banks, as there they have some capacity to draw a line and call a halt.
The _real_ question is the implications of a Greek default / euro withdrawal on European political integration. The Germans care a great deal more about that, and are probably prepared to pay a very high price for it. The question comes down to, how much of others' welfare states must they underwrite, and how much will they underwrite.