Regardless if this is the cost of migration it's an absolute loss for the native population. Suggesting it before suggesting net emigration is absolutely insane.
It's the cost of growth, including growth by domestic birth or by technological advancement.
Net emigration is bad for its own reasons. Namely that municipalities, states, and business financial models are all dependent on the reverse. The perils of population decline can't possibly be unknown to someone so "interested" in immigration dynamics.
That's why I didn't suggest it. Not only does it not solve this problem, but it creates several more.
