I agree (naturally

) with therewaslights observations.
Not only that, but if we study the immigrant population that should "assume the mantle of empire" we see that it is rather ill equipped to do so, both from an ethnic, economic and educational standpoint.
The main ethnic argument angainst it, is that they don't share ethnicity with the current elite - on the contrary the current elite originates - AND DERIVES it's power from the original core ethnicities (aka people) of Europe. In other words Barroso and his succesors constantly have to balance being a "true" Kroat, "true" Serb and "true" 'Bosniark' with the demands of being cosmopolitarian enough to preserve a multi ethnic empire. One can look to such essential tragic figures as Slobodan Milosovic or Ibrahim Rugova to see the perils. One became a monster, the other an irrelevance.
As to the economic aspect; most immigrants that could be thought of as "imperial" are consumers of ressources. To be blunt: Go home from the ammo factory and we will be subjugated with which weapons? - Note that I am speaking metaphorically here!!!
Compare that with the British empire, the Habsburg empire or the Romans whose core ethnicities rose to prominence as economic powerhouses of their empires, their economic glory more than their subjugation of other people were what kept the empires together.
Then there is the educational aspect of it: These immigrants are for many reasons unfortunately lacking in the skills required to be a core constituancy of a European empire. How many future ministers hide in the banlius of France and Belgium, in the suburbs of Bremen and Birmingham?
So while some in "the elite" may toy with "electing another people" as Brecht, rather sarcastically put it, not many, I suspect, seriously believe it - they would be knaves and fools to do so.
Besides one should not underestimate the powers of assimilation. I even think I read the story on 'The Brussels Journal about a moroccan mosque, where there appeared a rift between Waloon-moroccans and Flemish-moroccans - now there's unintended assimilation for you
Rather immigration and the stress it undoubtedly put on societys ressources will probably be an extra source of disruption.
As for riding roughshod over the will of the people - just look at Italys compliance with EU code or how a deeply centralised Belgium quietly became a confederation of two almost separate states.
It may be that 80 % of our legislation eminates from Brussels, but the dirty little secret is, that probably 80 % of that 80 % eminates from international standardisation bodies, some under UN auspices, but more integrated in "the industry" that is being regulated - such as for instance the Basel II rules, that has wrought so much havoc.
All in all: A Brussels unable to assert "empire" preferably as an "ethnically European" nation state is fated to become a mere wart eventually - though the process may well be bloody (as it usually is here in Europa)