The real problem is, a modern economy can't make do without women in the workforce or apartments or credit cards. Genie's out of the bottle.
Sure it can.
It will price in a "halved" labour force....and then all prices that are referenced and based on it that signal to other forces (people often assume these will magically hold when they wont, they will adjust to the social current).
Definition of the modern economy has been co-opted by the (western sense of) left for decades now. Keynesian statism especially (given this is what most appeals sociologically to insular elitists for all kind of self reinforcing and immoral reasons).
When it comes to the individual country, there is no need to march off cliff just because everyone else is. Those countries that can socially engineer their society to more family rearing narrative again will gain a long term advantage over others (its called investment....social investment is literally what makes organised well-founded hierarchies in the small and larger scale for civilisations to grow and prosper to what we have today).
The whole narrative has to change from the get go back to something more balanced. i.e importance of rearing children and strong family unit first....and the value of doing that (rather than the inversion that has been sold to many women in the developed world that children and families are a burden and that extreme careerhood is feminist liberation etc).
A career only if it can be balanced around that.
Then and only then will you get some idea of market failure interventions (i.e extra incentive pricing mechanisms) needed w.r.t family rearing.
Otherwise you are trying to mop an issue with the tap left on full flow.....as social narratives are upstream and extremely strong force versus economics in the end.
I agree with much of what you are saying though.