What if our world doesn't really need more people and the economic incentives (not everywhere, but in the west now and maybe everywhere later) are discouraging

What if our world doesn't really need more people and the economic incentives (not everywhere, but in the west now and maybe everywhere later) are discouraging children? You could see that as bad if you value tradition. But maybe people used to have a lot of children because they were valuable to work the land and now the incentives are different. In the long run is it bad if people have less children for a while? There are more people alive today than ever before.