Things like "jobs" and "careers" are so integral to society that we can't really imagine what society would be like in a world where people don't have any clear purpose. That's why you won't get a definitive answer. The whole idea of a singularity is that people don't have the faintest clue what day to day life would look like after.
We often to choose to believe that a singularity can't happen, because we don't know what that even means. We can't answer the simple question. So it definitely better not happen, that would be very inconvenient.