My entire life until past few years, the only population concern was overpopulation. What would we do if override Earth's carrying capacity? Now that it looks

My entire life until past few years, the only population concern was overpopulation. What would we do if override Earth's carrying capacity? Now that it looks like we'll coast up to not quite 10 billion by the end of the century with a flattening thereafter and maybe a slight gradual decline that would take at least another century to get back to the 8 billion level that we're at today... many people are reacting in a way I don't understand. Even this mild moderating of human population growth is being presented as the end of humanity, with imagery of ghost cities and "last human please turn of the lights" storytelling. Yet lower end of the forecast still predicts more humans in 200 years than we have today. There's nothing antinatalist about it. People who care about humanity continuing into the future should be celebrating our luck that nature seems to be giving us a chance to pause population growth while we figure out how to have 8-10 billion in decent living conditions while not wiping ourselves out.