It's mostly seen as a bad thing in the lens of ethnic nationalist ideology that low fertility rates will change the demographics of a country (see Great Replacement [0]).
After all, if Musk (and other capitalists) needed, they can get labor from other countries south of America's borders, but there is a push to not make these workers Americans! This isn't an issue only in America either.
>[...] is a white nationalist far-right conspiracy theory [...]
Native Americans would disagree.
It's a (bullshit paranoid) predictive theory about the modern day that has nothing to do with the historical genocide of Native Americans by white people.
It's been around for a lot longer than 2010. It has been a popular subject matter in Europe for decades [1]. I guess someone just decided to finally put a more official, catchy title to it and publish books. Does this particular author have a racist tone? Perhaps they do. But ask an average European citizen back in late 80s, 90s and they'd tell you what's up without skipping a beat. It's something you can see from a mile away. Pleading ignorance won't help.
[1] Your media won't tell you this, so don't be surprised. Talk to a handful of locals to get a sample for how people really feel about things. It's a much better barometer than getting your news from something like Voice of America.
It's the same argument wielded to discriminate against immigrants. It was used against the Irish, Italians, and Polish in NY City to name a few. Each group was "ruining America". It takes 3 generations to assimilate, but everyone anti-immigration wants them to "speak American" in one generation.
The "Great Replacement" specifically talks about this as being a deliberate plan by "wealthy elites", and again, is racist paranoid bullshit.
If you're going to talk about a specific thing, you can't just generalise it to every concern around immigration.
And while there are genuine concerns around immigration, like housing capacity, how to help migrants settle in, etc., most "people on the street" are just complaining about lazy immigrants who are simultaneously "stealing our jobs" and going on benefit.
to outsource raising children to places that can do it for less & ensure competition for low-paid jobs stays high...
what difference does it make
It’s not bullshit. The UN itself is where the term originated and it’s clear that whites are being replaced. The questions are whether that’s an undesirable thing and what the best course of mitigation is.
Typically, once people admit that, they start trying to justify why whites should be replaced. However, any argument justifying white replacement can be used equally effectively for any other group (e.g. Israelis, Muslims, Chinese, blacks, etc). IMHO best not to attempt to replace anyone so that we don’t devolve into Hitlers.