Personally, I'm not exactly thrilled with life, so I don't necessarily want to replicate that anyway. But at the same time it's not like I want humanity to die out. So ethically it seems complex.
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 .
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.