How about paying people to have a vasectomy after they have 2 kids? But that will never happen because if birth rates decrease who will support the ponzi sche

How about paying people to have a vasectomy after they have 2 kids? But that will never happen because if birth rates decrease who will support the ponzi scheme pensions? In all seriousness the resources required for the average American lifestyle and population density is sustainable. The growth rates of some developing nations are pretty terrifying though.