It's absolutely not going to work if you can afford children without working. Literally zero people will do anything they don't absolutely feel like doing under that social regime.

No country can run entirely on charity.

Then society will figure out a way around that - either by paying better, offering better job conditions, or automating the work away.

Instead of thinking about the toilet cleaners we’ll lose, think about the poets and physicists we are missing because they need to clean toilets.