Chinese speed. We pick up technology faster than anyone. We industrialize faster than anyone. We pickup influence faster than anyone. We raced past these countries economically and technologically and we ingested the developed nation disease like a side-dish.
I think you are right on one point: China's birth rate will not rise until people see the consequences. Right now, the first generation that has prioritized self and career accomplishment have not yet grayed and died. When they do, when people see the poor state they are in, with all their riches and power offering no shield against the pain of dying alone to disappear forever leaving no legacy, we may find a turning point.
As most people here know, I chose surrogacy with my wife and he had 4 kids in 38.5 months. We are actually seeing some change in attitude, although I don't know how widespread this is. My wife is saying she sees a lot of Chinese couples in their 30's trying all kinds of crazy shit to get pregnant. This is a change from when she says she used to see so many people either brag about how comfortable the DINK life is or actually angry that any grandparents want them to have kids and swearing to never reproduce as if that means they win that fight. So for some people, maybe a rising number of people, the attitude is that they want to have kids, but they wanted to stabilize their careers and finances first. In a China where surrogacy is illegal, this is a dangerous game to play. The female body becomes too old to generate viable ovum and give birth even with help rather early. Late-30's is less than 50% success rate even with the best tech. Mid-30's was your last reliable chance and early 30's you would have breathing room but don't waste it.
So moving forward, there will be 2 ways to do this:
1. Prioritize family over career. The cultural change would be immense. Instead of making the best of yourself and then seeing if you can pass it on, have kids straight out of college or even in college when nothing is certain and see what kind of life you can make from there. This would probably hinder China's tech advance as more young people are pulled out from the extreme work culture that it really takes to haul ass in the tech world.
2. The CCP has to make surrogacy legal. Women should freeze their eggs right out of college, and I mean freeze dozens of them in anticipation of loss from failure, and then reanimate them when their careers are stable and hire a surrogate to bring them to life. An artificial womb is ideal but not nearly here yet.