The near and long-term limits of relying too much on migration. Near-term corporate economic interests are ignoring long-term negative trends, which if not addressed could harm national economies and social cohesion.
Every region of the world has experienced declining TFRs (even those with high TFRs). At some point in the future, mass migration will face greater limits. The only real solution for advanced economies to address long-term population decline is to find a realistic way to increase natural fertility rates.