If the EU is to survive, it will have to craft a solution to the eurozone crisis that is politically as well as economically sustainable. It will need to create long-term institutions that both minimize the risk of future economic crises and refrain from adopting politically unsustainable forms of austerity when crises do hit. They must offer the EU countries that are the worst hit a viable path to economic stability while reassuring Germany, the state currently driving economic debates within the union, that it will not be asked to bail out weaker states indefinitely.
I now think there's a less than 50% probability that the euro survives in its current form. The costs of staying in are very high, and as we're seeing in Ireland, the benefits are extremely uncertain.