The way you make an alarmist forcast is simply by using those years when the biggest inflow has happened... and assume that it will continue as such. Even more alarming is if you can extrapolate a trend: that if the number of immigrants has risen, then you assume the number will grow as earlier. And assume that people will have as much children even if they get more prosperous. So if Sweden would get well over 100 000 people every year for the next couple of decades, sure, it would transform the demographics. Yet there are about 7,6 million ethnic Swedes in Sweden. But that isn't going to happen like that as immigration policies are changing.BjornP wrote:
No, "the math" doesn't say that anywhere
Year 2015 was the exceptional year, notice the amount of applicants in 2016 in Sweden:

The bigger problem is that unlike the US, countries like mine don't actually have such great ways to assimilate people as the US, with it's long traditions of immigrants becoming Americans in the long run. A lot of people immigrating to the US genuinely want to be Americans.