Just to reiterate, I have no answers. I'm a historian who doesn't have to worry about the real world too much, so it's mostly just a thought experiment looking in units of centuries.
But I do know, that just like most people will have coffee coloured skin in a millennium, and many will speak English to a converstational level*, the C19th concept of a modern nation state will give way to continental blocs and eventually, assuming we don't destroy our species, global govt with subsidiarity.
And as such, the EU is a step towards the future and Brexit is retrograde.
This is why I support it, not because it means I can doss round Europe more. When I said globalist, it meant I looked at a species, not national level. And this integration during the next millennium will be the best thing that has ever happened to humanity.
In 25 years, I've seen several hundred million Indians move from what we'd have considered penury to a comfortable, consumerist, middle class life.
And we need continental (i.e. EU etc) blocs to stop the tech giants and other monoploy capitalists taking the pîss. And eventually global govt to stop tax havens.
"This world was made a common treasury for everyone to share."
*The difference in the numbers of yoots wot speak English in France now compared to 25 years ago. Half the signs are in Franglais or pure English, all the tech terms are English. Half the internet is in English and many of the youtube vids the kids watch are too.
As such, we're creating a global culture. Give it a century and you'll see the west having an overarching intl culture.
And then your ghost will remember that rock and roll music was the start, but Teknivals was the first in Europe where our music could be understood by all nationalities.