Much is being written and said these days, especially today, around the globe re the Eurozone and its future etc etc etc.
Here is my 2 (euro)cents worth:
In addition to specific measures to address situations at specific member states, what the Eurozone needs is:
a) A "softer Euro" policy. A 1.4 or 1.5 USD per Euro rate hurts Eurozone exports and services such as tourism plus makes the Eurozone's market a "playground" for cheaper Chinese, American, British, Swedish, etc products. IMO this affects all Eurozone members, including the German economy, even exports.
b) A single currency needs a single Polity. In other words, it EU political union, all the way to a Prime Minister and proper government is needed. It should have been decided 19 some years ago in Maastricht.
European Political Union, be it with 26, 23, 20, 17 or even 15 members, will mean that the single currency will be based on a single (federal) Polity, with a proper European government, a federal income tax (US style) and a US style IRS, a central bank that is in line with the decisions of the European government (eg on exchange rate policy, see JC Junker's views expressed at the EP last week), a European NHS, a real single market for capital, goods, services and jobs.
(a) + (b) are IMO the best if not only decisive solution to Eurozone systemic problems. They are rather straight-forward but require realtalk to their eleectorates by the leaders of the states that will choose to participate.
53 years after the start of the EEC, the time for real union in Europe has come. It is as simple as that. With anything from 26 to 15 member states.