It would be foolish to not let the UK back in at some point, though. I understand how pissed everyone is right now about Brexit, and rightfully so. But 10 or 15 years on, things will be different, leadership will be different in member states, in the EU parliament, etc.
No, but some new situation can and will take it’s place. Europe has already rebuilt and reconfigured itself multiple times over the past century and a half, out of circumstances that were much worst than this round of British nationalist stubbornness. You rebuilt (with our help) after Germany actively tried to wipe out an entire people! Yet now Germany is arguably the leader of Europe and often on the right side of human rights issues.
Of course, at this point, given the problems the EU is having with countries like Poland and Hungary, who are still in despite trampling all over EU human rights provisions, who knows what the EU will look like in a decade from now, especially if the far right keeps surging in France and Germany.
I get that people are pissed at the UK government right now. But the EU was not meant to be a tool for the leaders, right? It was meant to build a safer, more stable Europe for Europeans and the world, was it not? Despite what shitty leadership exhibited by the conservative party right now in the UK, UK citizens are still Europeans, are they not? Isn’t the EU about the people of Europe and preserving their rights?