> they have to leave
No one is forcing them to leave. They can continue to live and work in Japan on their current visa, and renew it. Japan is simply raising the requirements for permanent residence using the traditional ten year path. To be clear, there are numerous paths to permanent residence that are much easier than the traditional ten year path. (Your favourite LLM can tell you all about it.) > completely absurd conditions
The new requirements are not this. In short: (1) modest Japanese language requirements, (2) more pension (or personal) savings, (3) higher salary. > If you're even turning skilled tech workers ... away
They are not. As I understand, Japan does not limit the number of skilled visas, such as engineer, humanities, or manager. Also, many of those foreign tech workers will make more than 10M JPY per year and can easily qualify for something called the "Highly Skilled Professional" (HSP) visa. Depending upon your "HSP points", you can get permanent residence after one or three years without any of the other requirements.The real issue is the people who have lived and worked in Japan for a long time, but don't earn large salaries. Japan is basically closing the door for permanent residence for those people unless they marry a local. My hot take: I am OK with closing the door for those people. They are basically earning a lower middle income. I'm not sure Japan wants or needs to have those people as permanent residents. However, they are free to live and work here as long as as they want. After they finish working, they can return to their home country. No one is taking that away.
> good luck caring for those tens of millions of people about to retire.
They will do it by expanding their existing (enormous) technical intern programme. There are already many low(er) skill foreigners working in elderly care.