It's a bit of both, though the former to a larger extent. Pretty logical and inevitable that if people don't have enough time or are too tired (physically or me

It's a bit of both, though the former to a larger extent. Pretty logical and inevitable that if people don't have enough time or are too tired (physically or mentally) to make babies, then they won't be made. Women choosing career over housemaking only exacerbates the issue, but also this choice is forced by still-immature social expectations combined with a brutal economic model. End of the day, Capitalism drives extinction.