I know it's off topic, but could you clarify how you could see this happening?
I mean the only issue I can see is that the EU will end up with multiple, smaller finanical centres, hindering scale. But other than that, I can't see the problems of EU with respect to Brexit.
Now, the euro without transfers, that's a bloody problem, but that's been a real problem for 20 years, and no amount of ECB bandaging will fix it.
Innovation must stand up to the test of time, but history teaches us that large empires and political unions generally don't. Even the US might be having trouble one day.
I cannot look into the future, but as far as I know, i would rather be in the same club as all the wealthy guys than stand outside and not have anything to deal with.
The UK might still have the idea and arrogance of being a big kingdom, but they're really not. We'll see, i don't think it will end neither good or bad for the EU in that regard, but if the days comes that UK is derailed in any way, the EU will not help - i think.
And that's dangerous of course, but its solely a problem the UK put on themselves. Good luck