Like Mao who said (so the story goes) that it was too early to judge the effects of the French Revolution, perhaps better wait a bit before reaching a conclusion. As a terribly gross generalization perhaps it comes down to pond size. Small stroppy fish in a big pond don't get very far but in a smaller pond they feel they at least have some influence and tangible contact with government. Difficult to claim that for ordinary Europeans. Worth remembering also that the establishment (the UK Civil Service) has been firmly against Brexit from the word go and have dragged their feet significantly. This isn't just a moan from the pro-Brexit crowd; it's pretty much accepted on both sides that this is what has happened.