One of the arguments I remember that was put forward,
is that it would be too difficult to bring back / create the cash money needed,
as the printing presses are now destroyed.
As 97 percent of the money we use is electronic ( in western europe ? ) ,
why not focus on creating electronic representations of currency.
Also, lets organize the interface with euros, if need be,
to reduce dependency on external trade.
If this scales, it can make a significant change to the politics imposed on Greece and enable the current or future governments to be in a better negotiation position.