The Cairo area was previously projected to grow another 6 million people in the next 12 years. https://www.macrotrends.net/cities/22812/cairo/population https:

The Cairo area was previously projected to grow another 6 million people in the next 12 years. https://www.macrotrends.net/cities/22812/cairo/population https://www.macrotrends.net/cities/22812/cairo/population It will take longer than 12 years for this new city to reach 6 million people. So what will happen is the population growth will slow some in Cairo; there will be NO population decline there.