I don't believe the concept of some 'natural order' the book seemed happy to worship. Nature is always in a state of flux, and species will always compete and alter their environments. Limited resources means all species are 'takers'. I would argue that it is even more 'unnatural' for a dominant species to deliberately cede dominance.

There is plenty of evidence suggesting we are currently on an unsustainable path with regard to the continuation of our own current lifestyle. I doubt it will lead to the end of life on Earth, and (regarding the book) I'm not quite convinced that a return to hunter gatherer societies is the proper solution.