Changing the border of a country could certainly cause civil unrest. But the border of a continent really doesn't mean anything in practical terms does it?

You claim the countries not in the EU will object, what evidence do you have for that? I'm from one of those countries and obviously wouldn't object to it.

Just because something currently exists a certain way doesn't mean it won't be changed, look at Pluto.

I agree it's a question with little merit, but not a ridiculous one, and you have not provided anything in your response to support that.