I don’t think so. Of course it’s hard to predict what Europe will look like in 100 years, but I’d like to image the EU more as a service provider for its member states. Maybe the military will be combined and the economy is already very much linked together which will increase. But I don’t think the member states will cease to exist as sovereign nations. Europe is far more diverse not only in language but also in culture. That is in my opinion a strong feature of the union as it is a union in diversity.

That’s the way to do it. The problem is that the request originates from the browser of you website visitor. You need to open a path for them to you media server. Nginx and it’s reverse proxy functionality is exactly what you need for that.