Couldn't put it more simply or succinctly if I tried. The topic is huge, yet the absence of further discussion by others is quite telling. I think natural selection is actually very much alive and well its just not in ways we've traditionally been taught to recognize. One of the stronger signals is that there is probably LESS, pressure to do or to live in any such fashion as there has ever been throughout all of human history. Basically nobody could care less. So in turn, only the already-inclined among us are opting to have children.