Breaking up the EU in this way would, in practice, break up the EU.  More important would be to devolve increasing powers to EU institutions - as attempted, in a small way, in the Lisbon Treaty.

The reason many European still like the EU is that it isn't very effective or efficient as a superpower - it can't really play the superpower game - and they don't want it to be able to - in much the same way as Switzerland isn't an actual player on the world stage in the military sense, but still quite influential all the same.

Most Europeans don't want to compete with the US, or with Russia, in military terms.  Neither do we want to get caught between them.  Hence the utter stupidity of Georgia's actions.

It's time I got out of this game....