[_delirium]

I agree the population size is a huge part of the problem, though I think it has more to do with immigration worries than voting-in-EU-institutions worries. There was already a bunch of nationalist ire over the proverbial "Polish plumbers" flooding western Europe and undercutting local labor, once they were fully admitted to the EU with free movement of labor. The prospect of 70 million Turks having the right to move to any city in Europe is much more unpopular than that (and good fodder for anti-immigrant populist parties), because there's more of them, they're poorer, and they're perceived as more foreign. If it were 10 million Turks, there might be more of a chance of getting people to agree.