> Now, when all these things don't apply anymore, or you have better replacements, you simply don't need children.

Oh you still need them for all of those. It just so happens that developed capitalist countries figured out you can use immigrant's children for this, rather than paying to grow them in-house, since with outsourcing children you bypass a large chunk of the cost.

Developed countries already sold their own children's futures in exchange for short term equity gains, now it's being done to countries where outsourcing happens.

Capitalism is eating fertility.

> Maybe when children become scarce, and the whole social security civilization collapses, children will again start to be worth something. And then, there would be more of them. But not until then.

Aye, agreed. It will swing back one way or another.