I see. I didn’t mean literal genetic evolution. Cultural if you will.
Parents who fail to instill love and desire of family into their kids won’t get to be grandparents. A few decades ago maybe you could take it for granted “everyone ends up having kids” now it obviously is a dead end unless you really help your kids through it. It feels to me like the next generation will have parents who will be intentional about this value. Others won’t bother having kids to begin with.