Many "first world/developed" countries are already starting to rely on immigration to have a ~2.1 birth rate (necessary for non declining population levels). I

Many "first world/developed" countries are already starting to rely on immigration to have a ~2.1 birth rate (necessary for non declining population levels). I doubt vasectomies would fly in other countries. Not to mention the idea of vasectomies for every teen is unfeasible and dumb.