I am not an expert, but it seems like most developed countries are learning to deal with a shrinking population. The current decline hasn't had effects like loosening up the job market, so it seems to me this means it's not currently causing any problems that would be catastrophic. There's clearly enough workers for the work that needs to get done.
I think there's not yet been a article of all the 'doom and gloom' of population decline that actually explains why it's worse than overpopulation.
Because the problems come years after the birthrate decline when a large portion of your population is retired and you don’t have enough young workers to fill the roles they typically fill
For one, those roles dont pay worth a damn anymore. Two, many roles are being automated.
This society we built is now too expensive for anyone but the top 10 to 20 percent to afford. All these old people are expecting youngsters to foot the bill, but the young cannot even afford to look after themselves let alone an entire generation of seniors. How the hell are they supposed to afford kids?
It relies on the birth rate in other parts of the world to stay high (something you can never guarantee), and requires that those countries stay poor enough that they want to leave everything behind and emigrate (something you can't guarantee, and also something shitty to try to guarantee).