How puzzling that the primary threat to European Unity would be the European Union.
The unelected bureaucracy overeached their usefulness.
Two things could have saved them.
One, real elections for the people who actually wielded the power.
Two, actual, enforceable limits on the power of the bureaucrats to regulate the minutia of life.
If they had stuck to the Euro as a european currency (allow the national currencies to float against it) and freedom of travel throughout Europe, they probably could have made it work.