(1) If you're relying on immigration, that means that you need foreign people to remain poor and without adequate access to healthcare and education, because only under those conditions are humans having enough children. https://medium.com/non-violence/stakeholder-control-deliberately-childless-adults-impoverish-everyone-need-global-poor-to-remain-a0e98126c133 And that is a plainly immoral system. (2) You're aware, right, that birthrates are crashing all around the world? At the current trajectory, there is a point in the future at which not a single country will have a birthrate above replacement.