The Euro will survive, but it has changed from the original concept of the currency. The world needs an alternative to the Dollar, and the Euro fits that bill, although, like the Dollar it is going through a rough patch.
We maybe need to replace the European Central Bank as it suffers from impotence due to conflict of interests. It is not performing like the Bundesbank used to, and it needs to.
There will be some countries that will eventually leave the Euro, but not yet. If the Euro hadn't have been introduced, all those countries in trouble would be in exactly the same position. Obviously, Britain staying out of the EuroZone remains the best position for us at the moment.