The cost of doing so would be gigantic. Nobody in Europe would want to pay that.
Actually the Euro was introduced to keep Germany under control:
http://www.spiegel.de/politik/ausland/historischer-deal-mitt...
Without the Euro the Bundesbank had controlled the most important currency, the Deutsche Mark, alone. Many countries in Europe had been depending on the Deutsche Mark anyway - without being able to influence any decisions.
The Anglo-Saxon press is obsessed with the Euro. I've been reading a lot now over the last years about the Euro - mostly written against it. Article over article predicted its death, often within days or weeks. The Euro is still there.
Instead the articles get more laughable day by day.