The democratic election does not necessary equals a good choice. People voted for dictatorship in I. French Republic, Weimar Germany, or in 1946 in Czechoslovakia. The outcome was a disaster, war, or unsolved political crisis that paralyzed society for years or even decades. While I am critical of EU and I consider it to be economic, political, and social failure; I do not believe it destruction is smart. EU needs to be reformed and rebuild upon better concepts, where the elites would understand regional, national, and social differences among larger European world. UK will not benefit from leaving EU, it already pays with isolation, declining currency, proposal of revoking English as official language from EU. Students most likely would not get their titles and degrees recognized in EU, and there is a huge possibility of many banks, investments banks, and conglomerates moving out of London.
There are so many examples in the European history where larger political entity dissolved and did not bring anything good to subsequent states or brought hardship: Austria-Hungary, USSR, Yugoslavia, Czechoslovakia, Hansa trade system, Holy Roman Empire, Western Roman Empire....