the €-Mark, as currently constituted, would not be viable.

It doesn't matter if the debts are measured in Euros, DMs, Pesos, or the soon to be offered New Mexico Tamale.  If the people who owe the money can't make money to pay it off, they don't have the money to pay it off, thus, they can't pay it off.  

Maybe I'm the dumbest m/f'er on the planet, but this seems Real Simple.  To me.  

Ever since I learnt about confirmation bias I've started seeing it everywhere