My answer

The euro makes all the sense in the World if:
- all the countries are able to consistently obey the criteria issued for the currency existence - hence, its public finance health;
- the troubled countries can raise its internal competitiveness to compliant levels;
- there is a number of political reforms that lead to a structured approach to the European economy as a whole.

If not, there will always be the risk that the internal pressures from the different paces of the countries will tear the currency apart. Because, and that is for sure, it won't be beneficial (for no one) that the rich countries keep on financing the poorer and troubled economies inefficiencies. For the rich ones, it would be a stretch on their taxes and their investment capability in their own economies. For the troubled economies, it would mean a loss of independence, as there are "no free dinners".

We shouldn't have many illusions. The eurozone inability to provide an answer to these problems over the last years (they were only raised by the global crisis, but the issues existed over the last 10 years) makes the European Union on itself being at stake!

http://economia.publico.clix.pt/noticia.aspx?id=1423830