Instead of only satisfying our Bodily needs, all Mankind will gradually pursue more intellectual goals. Imagine people all over the world adopting Gandhi's main mentality: Peaceful resistance and vegetarianism causing a serious diminishing of human and animal suffering.
Now combine that with Kierkegaard's abstinence-stance leading us to less diseases, unwanted children. Which leads us again to a lower populated and thus more comfortable World, I think.
That makes sense. I just found your language about "ruining this Body we call Planet Earth" and "the Earth surviving in a more cerebral, less instinctual way" confusing.