Half of young Japanese women (and a large fraction of young men) have no romantic relationship. The result is a big decrease in births.

I am sad for the people who have despaired of finding love. I understand how women reject marriage if the price is losing their careers. The characteristics of normal Japanese marriage strike me as very unpleasant, and well worth avoiding; but a couple could decide together to have a different sort of marriage. As for the decrease in births, given that the human population is increasing, I think that is a good thing.