That's what everyone says but they're just Maginot lining it. There's a new frontier: gametogenesis, embryo sequencing, and paid surrogacy if not artificial gestation. When that frontier opens the storyline changes.
It's still very difficult to raise a baby on your own and even with two people. It will still feel like someone's career is harder to manage with a child, and so I don't think these things are really going to make much difference for the average person that will likely not be able to afford these things anyway.
A committed married couple having children at a healthy age, feeding them well, and keeping them safe are going to still perform extraordinarily well against what you've laid out, and will likely also have higher happiness levels.
That's the real paradigm shift.