Much of the decline in fertility correlates with the development of poorer countries, increasing literacy and education of women, a migration from the country to the city, and a collapse in infant mortality rates with the arrival of modern medicine. All good things. But as Last describes, a population that is both shrinking and increasingly elderly leads to stalled innovation and other serious economic and political problems.
Everyone should be welcome to live life as they choose, remaining single or childless if that suits them. Freedom really does matter. But at the same time we ought to be thinking hard about how to make our society and our culture more child-welcoming. It’s a matter of life and death.
Kill me now! Why should humans be eternal?