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I disagree.
The homogenization of the population will happen in our lifetime. There are many internal migrants, mainly those who moved from Eastern EU countries to get a job in the West, and the migration from external sources will only strengthen. Chiefly this will happen in the West more but still.
As for France if EU becomes a state there won't be any France anymore. There won't be any French citizens, only EU citizens. EU would have to care about those.
In your scenario those factors won't support the EU becoming a state and dissolution of France in the first place. And these people and companies and institutions and whatever IRL do exist.
They can be also part of the group who has no interest in unified EU, because they look beyond, are globalist, and want no border anywhere.
So in a sense I do agree with the first part that the EU won't ever be one nation.
In fact I should note that I believe that such unification, that eradicates national borders and abolishes national legislation and governments in the following decades won't happen. The phenomenon, that time to times voices in Brussels demands to change decision making of the EU Council form unanimous to simple majority, I dunno where it will lead.