Of all the plausible theories, this one seems the most far-fetched.
Every single econometrics model I've run on every single Western society's budget (USA, Canada, Germany, France and the UK are what I tested) says the countries will go bankrupt if immigrants aren't taken in. I'm sure the elite have run these models or have some guy who did. A guy like Carney especially knows these numbers. My models say the countries will still go bankrupt even with immigrants because I don't treat the known IQ regression toward mean of second or third immigrants toward 100 like approved orthodox econometrics models. I treat the immigrants regressing toward their race-mean which isn't 100 relative to White people and this will drop productivity significantly despite more immigrants. Liberal approved econometrics models would never ever bring this up though because it's a hate crime.
So, realistically, most White nations are bringing in immigrants to avoid bankruptcy but they're going to go bankrupt anyway. But you know me. I prefer the jews hate White people, jews have power and influence, jews use that power and influence to genocide Whites and that's the why reason because it's actually the cleanest.