So Japan needs more people because their pension system is unsustainable. And when all the immigrants who came in get old, Japan will need even more immigration

So Japan needs more people because their pension system is unsustainable. And when all the immigrants who came in get old, Japan will need even more immigration to make up for the immigration they had before, and all the new pensioners. This is not sustainable. This is a Ponzi scheme. Continually kicking the can down the road.