As long as living standards are lower elsewhere, you can just get replacements from other countries. You spend less this way as well and don't have to raise and educate people. You can also call people racists if they don't like it.
The birth rate is dropping the world over. As overpopulation with its resultant trauma and poverty decreases we will no longer have the immigrate-at-all-costs demographic to prop up the system.
Most human poverty does not result from overpopulation.
i support open immigration but current policy just gives us the worst of both worlds. having children is financially impossible, moving here is legally impossible, so of course the only demographics doing it are either extremely rich or (mostly) extremely desperate. there's just a lot of suffering involved, which doesn't encourage positive outcomes in either set of folks. great world we've made