A better solution would be to integrate the Greek economy into a paneuropean federal country, that simply eats the losses of Greece. I am certain some states in America are net beneficiaries of federal spending (more government dollars flow into it than are retrieved through taxes.)
This is likely a lot better solution than local currencies: I would back a (metaphorical) 'civil war' (being on the side of the North of course) in Europe in which countries are really kind of shoehorned back into a federal European country under centralized rule, a central constitution, and with limitations on 'state rights'. (Note that all the while, as in the analogy, this central federal paneuropean country would remain democratic.) I've never heard anyone else express this opinion though.
EDIT: I don't mean civil war literally of course, and have edited to clarify. I was just drawing an analogy with the South seceding from the union. Obviously there is 0 chance of any actual war, nor would anyone want one for a minute. The difference between past wars is that there actually are democratic European institituions - i.e. the EU - just as America remained democratic through and after its civil war.