Market participants have perceptions of the market's future direction and they act upon this and, collectively, they bring about those conditions, correct? It's interesting how, as Atilla has said, everyone seems to be predicting the end, or at the very least a lot of trouble ahead, for the € and yet nothing is really happening.
What do you think would happen, from a market perspective (obviously doing this would be illegal), if everyone on this board agreed we would all short the Euro against the U.S. Dollar at a certain time on a certain date just to see if it could jump start a precipitous fall and then everyone could activate put options bought beforehand? Effecitvely we would boycott the Euro in the retail markets. We can't do this of course since it is illegal and, anyway, I dunno whether anyone would make any money but it would just be interesting to see how powerful/less we all are.
@ OP if the Euro collpses wouldn't you just get to keep the currency you had shorted it against? You can't be expected to buy something which no longer exists.