Almost two thirds of Japanese men in the prime marriage years, 18 - 34, are single. Almost half of women in the same age are single, too. A quarter of them say they are not looking.
Japan is the oldest population in the world. If they don't have a significant increase in the birth rate, their population will start to shrink. They will run out of workers to pay for their old people. They will run out of workers to make people.
Things don't look great for Japan's future production of Japanese.