Something on which I harp: the getting to such a world will most likely involve the death of BILLIONS of people and maybe other creatures. There may be whole districts in which there won't be enough living people to bury and/or cremate the dead. Rotting corpses may cover whole acres. No one can prevent the winds from bringing the smell of decay to every part of the globe. What will that smell and the microbes producing it do to life on the earth? There will be no escape from the odor of death, not even for Musk and Bezos. Unless they blast into space and stay there for however long they 'need' to.