I imagine that as the EU expands it will eventually be able to occupy a role like, say, NATO, as well as its usual economic and political responsibilities. They may not seem like much, but not letting the weaksauce Balkan states into our club wouldn't reflect too well on our ideal of unified Europe. I do imagine Turkey will probably join one day, and that might not be too bad in the long run. It'll keep them distanced from Iran and Saudi, which is always a good thing.
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