Every life-form alive today has had its ancestors pay whatever price it took, for their genetics to be relevent this minute of this hour. To not pay that price at the cost of extinction as a genetic entity is a price that most life-forms are not tuned to pay, since to do otherwise is to willingly be put out of the scope of natural selection, into irrelevance as a living genetic entity.
Yes, and for those ancestors who could not reproduce due to infertility? What became of them? Natural selection works both ways, and, as you posted earlier, we are "part of Nature's system" - isn't IVF a work-around of what nature proposes?