They will roll with the punches or they will disappear. I am more amoral on such things I suppose. This planet is hospitable to life itself and nature adapts. I do not believe there is a right form of life and life will adapt to whatever exists as life has flourished in far more in inhospitable conditions than exist today. The changing planet will drive evolution, and that change can be the result of species disappearing creating room for something new or existing species adapting/evolving with the changing conditions.