I think society will limp along just fine without any subsidies for childrearing.
And people who want handouts for having kids are always saying that the childfree are going to benefit so much.
Yes, if the child in question doesn't turn out to be low intelligence, criminal, addicted, dependent in some other way, unemployable, a teen parent itself - then it might just pay its own way through tax revenues and such over the course of a lifetime. The notion of it being an actual net gain to society, economically, is quite iffy.
The benefits of not adding a child to society are immediate and unequivocal - a lighter footprint on all infrastructure from education to health care to roads and bridges and airports and public transport, a lighter carbon/garbage footprint on the environment compared to parents, no liability for taxing the social services and courts systems with child custody, child maintenance and other disputes, no potential liability for foisting a criminal on society, etc.
Not sure how it works there but in the US, the mandatory payments we make to the Social Security and Medicare system cannot be bequeathed to a beneficiary in the event of untimely death of a childfree or singleton - but the childed heavily burden the system with minor disability and minor survivor payouts, payouts to caregivers of minors and payouts to stay-home spouses who never contributed, among other inequities and redistribution of funds. We are the cash cows of most social service / public assistance programs yet barred from being helped by them, even in dire straits, because they only benefit people with offspring.
It's about time the child free were accorded the same respect and perks for their choice as the childed currently are, because there certainly are measurable benefits to society when people choose not to procreate. And increasingly minimal "benefits" when people do, especially people who have not really thought it through, saved up in advance to prepare for emergencies or taken care in their selection of co-parent.