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Has no reasonable alternative to continuing to use English as its Lingua Franca. Oh, delicious irony.
English speaking people have an affinity to self government, having pretty much led the way toward it in the modern era. Bled and died for it, in fact. Saved the world from totalitarianism.
Of course Englishmen (non-pc, I know, but nothing else truly fits) are going to insist on ordering their own affairs rather than submit to a bureaucratic continental structure telling them what they can and can't do.
As an English speaking American, I heartily welcome my brethren to the free world of truly sovereign nations. Who knows? We may again need to save the world from the next folly toward totalitarian rule.