What about teaching people?
What concerns teaching, we can predict that AI will be able to excel in some skills that teachers won't. Nevertheless, I'm not quite sure if the computer would be able to motivate a student or evaluate a degree of his/her creativity. Although it's always better to "never say never" but the likelihood of teachers being replaced by computers is little, in my opinion.
Furthermore, if the computers become so omniscient, why don't we have them do absolutely everything instead of us? However, the fate of such society is pathetic to say the least.