Could in theory, but how practical? Fertility is limited to a theoretical maximum of roughly once every 2 years for 30 years (a friend has lived it, having 15 k

Could in theory, but how practical? Fertility is limited to a theoretical maximum of roughly once every 2 years for 30 years (a friend has lived it, having 15 kids), but the cultural changes to go from sub-1.4 to "recover with vigor" are drastic; couples living in high-density micro-apartments and thriving on high technology are a long way from living on a farm (as my friend had to resort to). Obviously this isn't a binary issue, so what constitutes "unrecoverable" is subject to debate - one has to consider what constitutes "cultural collapse" and, in a highly mobile world population, what other distinct groups will move to fill the relative void.