Realistically EU can soak up any likely refugee flow and absorb it, the problem could occur if that refugee flow was directed in it's entirety to some sort of small EU member, such as Norway.
Otherwise ethnic balance could not be radically changed, though ofc there is that nigh impossible worst case scenario where EU receives atleast 30+ m immigrants and those show african style birth rates with EU style mortality over 3 generations without being assimilated into local culture/way of life.
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Grumpy as always.
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