The national governments and parliaments should not forget the words of your fellow Austrian, Karl-Heinrich Waggerl: “Ask for God’s blessing for your work -- but do not ask Him to do the work Himself as well.” The subject of convergence in monetary union therefore does not just present itself -- as economic textbooks call it -- in external shocks which affect individual countries to varying degrees.
The key issue here is for countries to tackle the structural challenges they are facing, which are identifiable now, in a similar manner and at a similar pace. Otherwise, “internal shocks” would ensue. The individual economies would grow apart. But not due to an external event hitting a given region like a comet.