Apart from the question which EU countries will be in the core group, participation in EMU implies at any rate that the country involved transfers its monetary policy powers to an independent ECB. In that field, we will continue to see rearguard action, because the tradition of central bank independence is not equally rooted across the whole of Europe.
On the other hand, one should not worry about these recurring discussions too much, as the Treaty is rock-solid with regard to the prohibition to exert political influence on the ECB Governing Council. Obviously, the independence of the European Central Bank should not be confused with a lack of democratic legitimacy.