I recently read Sapiens. The author discussed how the Agriculture Revolution tied humans down into boring and less rewarding agriculture societies. Perhaps after thousands of years running freely in the wild, humans got bored. They needed to find higher callings. This was when religion started.

It seems like humans are now at the same junction. After getting all stuff we need, we are lost again. We have less children for economic reasons in the same way hunters did. Having and raising children is ironically the simplest way to find meaning in life.