Regarding immigration, Japan is actually making it a lot stricter now. Not sure how that will play out.
You're really overselling their capabilities.
See the "lost decades" or most recently, the hundreds of billions deployed for the failed hydrogen initiatives.
Additionally, all signs do, in fact, point to fewer new immigrants to Japan in the coming decade.
[0](https://mainichi.jp/english/articles/20260401/p2g/00m/0na/04...)
They have some core technologies in some niches, but they lag behind both the US & China in Tech. This is esp. true in Robotics, and their academics/industrialists have massive egos & racial pride from a bygone era to ever be able to bridge this gap with immigration. They even removed the Phd scholarships for people moving to Japanese Universities (which have been falling in competitiveness for decades)!
Of course that does make the issue more nuanced and harder to advocate for when we have all seen politicians don't usually push for long term solutions if their band-aid solution will outlast their term of office.