I'll just say that over 2 decades of trying and billions of dollars spent by the Nordics, Singapore, China, Japan, and Korea say otherwise.

Changing human motivations is significantly harder than drilling a new hole or putting up a solar panel.

No, it's a lot simpler. Governments should just have babies of their own, using donor eggs and sperm of people they consider to be high-value, using cheaply hired foreign women of any race for gestation, and raising them in specialised institutions - and funding it by abandoning all (indeed terribly inefficient) family-stimulating policies like childcare, tax benefits, etc.

To avoid political problems, make sure these new people do not become citizens so they don't vote, let them just be workers and consumers.

Chill out there Tyrell.

How is that simple? it seems like the massive cultural and political challenges are just being handwaved away