I've proposed actual solutions. A mandatory 2/3 child policy, just like the one child policy but in reverse. Fine and/or limit job promotions for those who don't comply. Draconian from the western perspective but less so than the one child policy IMO.
This is just transposing the problems that Western countries are facing right now, and addressing through immigration, to the current circumstances of China while disregarding the fact that developmentally China is still no where close to maxing out productivity gains through urbanization and workforce education levels. The demographics issue is something to look out for, but we are not at the point of enforcing a 2/3 child policy that quite frankly would cause justifitable civil unrest. Forcing someone to have a child versus forcing someone to not have a child is a whole world of difference and I would argue a far more bitter pill to swallow. The only reasons to actually implement such a policy is if China were in a drawn out total war or if the costs of not implementing such a policy would clearly cause huge structural issues in society. Point is there is still time to try out a whole host of other incentive-based/tax-based policies to encourage growth before going to the extreme.