I spend months of each year in each of three different European countries and mix with people from several more. There is moaning everywhere both within the EU and outside it but with the notable exception of in the UK, I do not come across any suggestion that the EU should be dismantled or that the Euro is a disaster. On the other hand I hear people say, sometimes less enthusiastically than at other times, that things were worse before the EU and that the Euro is useful.
Those who have never been important only aim for better times and are pleased/grateful for signs of improvement, they are free of hangups. Those who once were important miss that importance, resent its passing and long for its return - they also try to pretend it hasn't gone apparently in the hope that no-one will have noticed and will keep looking up to them. Moreover, some of the backward lookers will become really irate toward those who suggest that the importance really has gone, that the reality is one of the steady sinking of an edifice which is crumbling at the same time. Outsiders feel a mixture of embarrassment and sadness but the occupants of the clapped out has-been puff/posture all the more and hope/predict that anything and everything with the remotest chance of proving to be better than their shambles will come to a disastrous end.
The EU-Brexit subject is not so much a matter of one of the two having a patent on a solution to all ills as being a live demonstration of what can happen in the presence of a build up of frustration over tantrums not working any more accompanied by a refusal to accept (as the international comparisons show) being at best plain average rather than the best.