Counterpoint: cost of living doesn’t have any bearing on whether you want to, it just affects whether you will or not. There is no amount of money you could throw at me.
Yes, at you specifically, but for a lot of folks affordability does correlate with if they personally want to have a child, they aren’t ideologically bound to one state or the other the way some child free or quiverfull folks are, the switch to want children is turned on for them if the conditions are met in their eyes where a child is possible to have and raise in a stable environment.
It’s literally what happened with the baby boomers, and with Millennials and Zoomers too, although that one was linked to the subprime mortgage collapse, which ensuantly threw all those excess births into an unanticipated financial instability, which helped define the generation being extra weary of financial risks.