Despite changing the policy, many people are finding it too expensive to have multiple kids. Not to mention going broke trying to get decent housing due to that massively inflated bubble.

There's a lot of weird cultural things baked in now, too, A friend refers to her cousins as "brother/sister", since no one my age (millenials) has a blood related sibling anymore.
And the younger internet culture sayings "laying flat", or "let it all rot"

Frankly I get depressed looking at the demographic growth case for most places. I guess you have India and southeast Asia...