The technique of feeding someone poison slowly and constantly until they become dependent, and the ceasing providing the poison so the person dies, is an old trick. You ask my thoughts and I think the technique in your theory is practicable. I also am aware that certain long-lived organizations have called for controlling the human population (Georgia Guidestones, eugenics, Margaret Sanger/Planned Parenthood to throw out a few crumbs). I am also aware that the more "esoteric" and "religious" grouos think we are either destined to go through an apocalypse shortly or will benefit as a species if we contrive to make one happen (Great Reset, Build Back Better, antichrist/messiah narratives for more crumbs). Final thought: fuck you could be right. Either through design or accident this could come to pass.