Thankfully this will never happen, or at least not in my lifetime. You're proposing that people who have the power to remove custody of your children get hundreds of opportunities to gather information to do so. Even just one mandatory assessment meeting would be too much for most people to stomach, yet alone hundreds. No government could ever propose such a thing and hope to get it through parliament.
They have that power anyway, anyone can lose their kids if they aren't treating them right, they just aren't applying that power in an appropriate way. All the resource goes to a few families, whether they need it or not. And the rest of the children are left at risk to shit parents like these.
If you look at it as every person is at risk of losing their children because they are being checked, then either the checking is wrong or the parenting is wrong. But, if every person, white or black, rich or poor, had help and support pre-nursery, how many more well adjusted people would we have?
I understand the libertarian point of view of I don't want or need government intervention, but we aren't talking about personal rights, other than the personal rights of the child.
If you're a shit parent, that isn't your right. You have the right to treat yourself as you wish, but shit parents are damaging little people who literally don't have voice to ask for help. We can hope that parents will do the right thing by their children, but evidently, they don't. And ignoring the situation doesn't just damage the child because the damaged child is likely to go on to damage society, even their own children, in the future, and the cycle gives on.
If you ran a program that said, for the first 2,3 years of being a parent you will have a liaison, someone experienced to talk to about your stresses, someone who can give you advice from an experienced point of view, not only would the parent and child form a better bond, but you also result in a child who is less of a danger to society, which means you won't need social services down the line.
What I'm talking about is not "children's services" in the way we have them now, more like extending the midwife service that everyone gets when giving birth a couple of years, then hopefully needing far fewer social workers later