I've been thinking about this for awhile. On the longterm, it seems inevitable that eventually, the only way we will be able to reproduce is via artificial wombs and medical intervention. There used to be a "survival of the fittest" gate that would stop people with low fertility from being able to reproduce, as well as people who cannot survive childbirth. With modern reproductive assistance and medical intervention, many of the people born today are getting genes that are going to exponentially increase the reliance on these things for the next generation. Of course the world is a big place, and there are places where people are breeding without this assistance, but without the evolutionary pressure on a long enough timeline, it's possible all humans will be the results of artificial ensemination, wombs, etc.