I've wondered whether we might be seeing a new division of labor emerging: An increasing number of educated professionals elect to have few or none of the kids needed for the next generation of workers, while some lower-income people take up the slack by having lots of kids. This might actually be a sustainable social model, but it would require two things: (1) "Talent," however you choose to define that, needs to appear in sufficient numbers of children born to low-income parents and not just in children born to educated professionals --- my guess is that this is indeed the case; (2) crucially, society must be able to provide the infrastructure needed to raise children to productive citizenship, especially when some of these children are being raised by parents who don't personally have access to the necessary financial- and other resources --- and that's very much only a partially-solved problem.