I think it's just good to have open discussion on what these demographics changes might mean in the context of different societies. Both Europe and North America will see increasing migration from more overpopulated and poorer parts of the world, and this obviously presents its challenges to societies in the both ends of the flow.

I don't believe in "great replacement theory", what is happening is just a natural consequence of massive differences in standards of living and population growth in different parts of the world. Yet at the same time I can also see that this development isn't always without its troubles, like Sweden suffering from a wave of gun violence due to its failure to integrate many migrants who lack education and language skills, and many developing countries suffering from brain-drain. These are small-scale issues compared to the environmental impact of overpopulation, but they should still be discussed.