It's fairly well known that, in some villages, everyone is responsible for raising the children, not just the parents who conceived them. Over time, this process might evolve and grow, as populations evolve and grow, into the modern day version I've depicted.

I think this is stretching the reality of the situation a fair bit. In societies with very strong and consistent social norms, in communities where everybody more or less knows everybody (less than the Dunbar number), anybody can discipline children who are misbehaving. The children still have a mother and a home, and they know who that is and where it is. This will be much weaker in societies that aren't so much about the nuclear family.

I can't see any plausible mechanism to get a society with apartments and suburbs doing this though. (Meaning such a society would not develop such living arrangements, and such living arrangements would rapidly destroy such a social arrangement)

It's well written. You may have inspired me to write my own weirdtopia.