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How these transitions effect social/welfare problems is really another topic (although an equally interesting one - and I feel as though I would need to do more research to give my informed opinion). And you are right that immigration solves no ones long-term problem if the whole world develops and has a below replacement level fertility. However by 2050 I feel as though life expectancy will be much longer and humans will not be the only sentient beings on the planet (robots will be as well). So the situation is a little hard to predict.