Question comes to mind: who owns what share of all the Japanese assets (real estate, company shares, ..)?

If a big share of all valuable things is owned by international investors, that will become the real problem, as international capital will continue extracting rent from the coming generations.

If on the other hand the valuable tangible things in Japan are mostly privately owned by the older population itself, then their few children will inherit it and have a better chance of being parents instead of working hours and hours to pay the rent.