@Walter Hinteler,
It appears to me that the political divisions evident in Britain today are no more severe than those currently facing France, Germany, Italy, Spain and a large fraction of EU countries … and the United States as well. Moreover there are a number of common elements evident in all of these national situations involving growing public distrust of established political elites, a growing cadre of populist political movements and significant realignments of the voting bases of the dominant political parties in nearly all of these countries.
Meanwhile the economies of the EU countries appear relatively stagnant in a period of nearly worldwide economic slowdown. The UK may well find the economic benefits of freedom and reform exceed those of EU membership.
Finally, I expect that, with Brexit soon to be off the political table, more attention will soon focus on the several other acute economic and political divisions remaining within the EU.
The EU has so far been a great economic and political success, one which has also addressed previously long-standing,destructive rivalries among European powers - perhaps its greatest achievement. However, I have long believed that the poorly defined goal of "ever closer union" and the bureaucratic state that has emerged from it, risks overreach and the destruction of all its greatest achievements. I also believe that was the essential driving force for Brexit in the UK.