Germany would be happy. The German Goethe Institute which is to help Greek learn to speak Germany and prepare them for working inside Germany. German schools private schools which serve Greek students because the Greek education system is a shambles one of the worst rated in Europe. This is the most well thought out and productive winning move by the Greek government.
Greece wont be sanctioned, after all many countries have seized control of other countries banks and seized tens billions of dollars, this happens ALL the time.
Dont worry the Greeks are well know for planned out, calculated, well prepared and thought through such actions. Greece definitely will not find itself on the verge of an economic collapse. But rather Greece will have a "Wirtschaftswunder".
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Hopefully Greece Plan B is shelved and someone who isn't insane can draw up a new Plan B.