I totally agree, and my argument with the original post was that the author made it sound so simple.

Has any society successfully done this yet?

Basically, the only prosperous first world groups I see with fertility rates above replacement rate are religious subcultures (like the Mormons, Evangelicals, and Modern Orthodox Jews in the US). I simply don't see any other examples of being able to pull this off.

Anything can become cool and desirable if enough people think it is.

The acceptance of LGBT was largely won this way. Same with women’s rights and environmentalism (although that one is still in the midst of fighting for success).

You just have to settle for a long road ahead before reaching any tipping point.

“A man who moves a mountain begins by carrying away small stones.”

Germany in the 1930s. Not that we'd want to emulate their methods.