I teach about population decline in Japan and have started mentioning the solutions to this as getting a larger outside work force. With the number of refugees abroad, I know that Japan does take in several each year, but this could also be a solution to their issue.
I have also seen Alex Kerr's videos. They are so neat! I have seen ads for Japan, and also Italy, selling rural houses to have people who buy them fix and maintain. Due to Covid, Alex did not get many guests and is taking up rural gardening to provide fresh produce for himself and the community. It is so neat to see this example of population solution.
Rural living is definately not for everyone, but the videos are very fun the watch. I showed a trailer I made to my students to show how the population issue might be managed.