There's 2 problems with your line of thought: 1. The portion of the problem that is due to chemical exposure decreasing fertility and/or effective birth control

There's 2 problems with your line of thought: 1. The portion of the problem that is due to chemical exposure decreasing fertility and/or effective birth control/abortion is not a self correcting problem without identifying and stopping the chemical exposure and/or changing the economics of having kids to turn the very recent invention of having kids being mostly a choice, rather than a likely consequence of sex, into a choice people want to make sooner and more often. 2. The way this problem has been self correcting in history was through the destruction of the society through calamity or conquest and someone new moving in either with actual new people or with a new ruling regime. Neither of those sound like any fun to me, I'd rather people change the prevailing custom through discourse, as this article is attempting to do.