Taxpayers being drained by all the freeloading muslims doesn’t help
The failure in the promise of the EU lies in the expansion of the legal writ of the EU, away from just a “common market” and a single currency, into social, immigration, labor and other political and fiscal matters that needed to remain in the hands of the independent nations, if they were going to be handled effectively at all. Remove many of the EU policies that have over ridden sovereign national obligations and a number of individual EU states would be better off today, in part because the idea that the EU was going to save them would have been replaced with the necessary national work they needed to do for themselves.
There was nothing wrong with a western European common market or a single currency for the group; the 50 states of the United States have such a benefit themselves. That, as far as legal writ should have been the extent of EU authority.