The globalists will accommodate the tribal instinct. No sweat. They can have the Islam branch, the Eastern branch, and the Western branch, with each branch having its own customs, and roughly its own territories; and each branch seeing the others as co-equals, under a common world government.
There has been an incredible rise in the power of world institutions in the last 100 years. As with everything, ups and downs. Brexit and Trump are "downs" for the globalists, but the globalists will never be out.
We will just agree to disagree. I see more separatists’ movements and more countries in the future. The EU will collapse within a decade or be just a trade organization.