There may be "many" people not thinking about it, but there are measurably and verifiably not plenty, which has a definition something like "more than enough".

There may be "many" people not thinking about it, but there are measurably and verifiably not plenty, which has a definition something like "more than enough". Fertility rates in western countries, including the United States, are below replacement level. There is a far more disturbing dystopia waiting for us than Idiocracy.