Polish migration is permanent and how much will turn out to be transitory or circular. Poland's economic growth would suggest the pull factors over there are growing and the trend may stop or slowly reverse. Polish culture may go through a similar secularisation to Irish, Italian or Spanish culture leading to a similar fall in birth rates.
I don't disagree that sooner or later birth rates among minorities will fall, just as eventually they will all integrate and become part of a more uniform society. But this takes decades or even centuries, why must we keep recreating the same problems over and over again?

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