"if you're in a position where you can afford to shoulder the financial burden of having children, that's great and I wish you the best. if not, don't expect the small sliver of childfree folks to make up the difference for you. if we actually get to the point where society can't replace itself, maybe we can talk again."

It's exactly as rigorous as your argument. We've both submitted opinions to be considered. I'm not expecting more rigor nor inclined to offer more because I think we've both put out enough worth considering. But if you want to bring more rigor I'll read it.