Maybe we should make the language, German. But the French, English, and Russians would disagree with that. Maybe we can set up a democratic government in the truest sense. But what do we do about all the ceremonial kings in Europe. Diversity, a beautiful thing in my opinion, will not allow any such nation.
European unification is impeded most by one specific thing.
The British, since the Norman invasion, have tried to distance themselves from the affairs of Europe. This splendid isolation has been an ideal for other European nations as well. The French for thousands of years have tried to remain French. Cardinal Richelieu created a school to screen the French language from foreign influences. In an economic sense European unity is more of a possibility though it is still far-fetched.