2 is only just below replacement rate, which means a manageable gradual reduction rather than the demographic cliff-edge of 0 or 1 or the unsustainable boundles

2 is only just below replacement rate, which means a manageable gradual reduction rather than the demographic cliff-edge of 0 or 1 or the unsustainable boundless growth of 3+. At that rate it will be centuries before the world starts running out of people - plenty of time to anticipate and start planning more kids again.