Doesn't seem to be "on track" for happening, as their birth rates are also starting to fall, both in the U.S. and back in their home countries.
Before they introduced the 1965 Immigration Act the US was more than 95% white, now it's anywhere between 50% and 65%, and that's not a good thing. One only has to look at what Hispanics have done to their own countries to see what will happen to the US once they tip over into being the majority.
And if it's not Hispanics, nor blacks (who are already a plague despite their low population numbers), it will be someone else. The powers that be are intent on balkanizing the US because a population of minorities that hate each other is far easier to control. Africa and the Middle East can "supply" both the US and Europe with millions of future engineers, surgeons and rocket scientists for decades to come.
It will certainly be "interesting" to watch play out and see how "Secular Europe" responds to the problems that will be likely to follow suit.
They'll respond the same way they've been responding to it for the past 50 years. They'll pretend the problem doesn't exist, repeat the mantra that Islam is a Religion of Peace and call anyone that dares go against the narrative a racist. Their liberal mental framework, built around individualism and secular values, simply isn't capable of processing the threat a population of religious zealots can pose to a society, nor how to effectively deal with them.
Once ONE nation goes from secular/Christian to "Islamic State" the brakes are going to come on hard
Sweden. It will be Sweden. They have the low population numbers (under ten million) and import upward of 250,000 immigrants a year. Also, I sincerely doubt the brakes will come on at all. If you've read Camp of Saints, which has been eerily prophetic about most things, so I see no reason why it wouldn't be about this as well, it's far more likely the governments of other Western European nations will crack down hard on their own populations and suppress any worrying news from Sweden, and even unleash violence against them, rather than gut the sacred cow of Islam. We've seen it already in Rotherham, Labour was perfectly willing to let children get raped and brutalized than confront the futility of their insane worldview.
and all those horrible boogeyman that Western Europeans believe we've progressed beyond will come out to play
Isn't that always the case? Ivory towers are only good when the unwashed third world hordes aren't busy battering down the door.
America may or may not follow suit with regards to its own Islamic population
The US has less to worry about Muslims than it has with Hispanics. Their birthrates might be going down, but there's still enough of them willing to immigrate to tip the balance.
But until they demonstrate why they shouldn't "be let out of the sand box" on a truly massive scale
Their behavior in their own countries should be proof enough. I remember reading a news story about Japan letting in some 20 "refugees" and not a month afterwards two of them got caught raping a woman. One needs to watch one video of a stoning, to witness the sheer group savagery of the act to realize these people will never be able to function in a Western society.
In the end the most humane thing to do is to leave them to their own devices and not meddle in their affairs. I am as much against them coming here as I am Western powers going over there and trying to assert Western values on people that want nothing to do with them.
It's telling that Iraq, Libya and Syria were better places to live when Saddam, Gaddafi and Assad were in firm control than when Westerners tried to play nation builders and introduce the concept of democracy to a people that routinely descend into sectarian violence every other decade. The direct result of that is ISIS, that behave more savagely than anything any of the brutal dictators that were in power before them.