Given the opportunity, people will do anything else than have more than 2 children, which is the requirement to increase the population. There’s just better stuff to do than spend multiple years taking care of the baby. Any argument other than “for the greater good” won’t sound reasonable to educated population. Talking to my friends, especially women who already have a child, they keep mentioning the opportunity loss when you go through pregnancy and birth (career, vacations, personal growth and etc.). You can call it selfish, but it’s the reality and nobody wants to fall behind. Everything you mentioned is great, and I support it, but I doubt it’ll convince young people to sacrifice at the very minimum 6 years of their life (pregnancy + first year).