What happens if Japan takes in zero immigrants?

Japan's new Prime Minister Sanae Takaichi won a supermajority by campaigning on a hard immigration cap, reflecting public support for restricting immigration despite the country facing an 11 million worker shortage by 2040. The government argues automation and AI will fill the gap, but the article argues this is unrealistic given Japan's poor software adoption and declining robotics leadership compared to the U.S. and China. Without immigration to support an aging population and sustain tax revenue, Japan faces catastrophic consequences including a 20% pension cut by 2040, widespread elderly poverty, and potential debt monetization triggering inflation that would devastate retirees.