"We can thus imagine a technologically highly advanced society, containing many sorts of complex structures, some of which are much smarter and more intricate than anything that exists today, in which there would nevertheless be a complete absence of any type of being whose welfare has moral significance. In a sense, this would be an uninhabited society. All the kinds of being that we care even remotely about would have vanished… the catastrophe would be that such a world would not contain even the right kind of machines, i.e. ones that are conscious and whose welfare matters." –
Bostrom, 2004