Your attitude is constantly being bread out of the species, on the margin. People who want children, and to a lesser extent people who want to make children, define the future of the species. Anybody who wants to can opt out without either fear of the species disappearing, but also without the ability to cause the species to disappear by opting out .
I was thinking more about principles (ie, what would I want people to do) rather than what is actually likely to happen.
There is a lot of research on this topic. I know later studies contradict earlier studies, but I'm not sure who to believe here. Wondering if anyone can help.
In case it isn't clear, the basic question is the effect of having children on happiness.