IMO have to weather through cohorts of increased life expectancy due to modernity until their property/wealth transfers (especially in urban areas) gives newer gens more space to family plan. Older I get, the more people who previously didn't want kids due to material conditions lament wanting kids but still not having said conditions. Gut feeling is once enough density in East Asian countries drops from insufferable levels, TFR will pickup. Though might still not enough for replacement TFR, but perhaps settle at a more sustainable equilibrium.