There's only so much work to do. Machines seems to be eating more jobs than innovation can create. Eventually, we will face massive (over 50%) unemployment, unless of course we change a thing or two in our way of life (such as 20 hours work weeks or such).
Machines are great, but we do need to mind the way we use them.
In the short term the less intelligent half will be massively unemployed until we get something like Gattaca going and then everyone can basically be researchers (or writers, etc).
The real question is what happens after the singularity.
> The real question is what happens after the singularity.
Probably more true than you realize. The most likely scenario for a technological singularity is an AI that writes a slightly more efficient AI, and so on until world domination if it's quick enough (which is likely).
So we better know exactly¹ what we want the AI to do, or it might for instance tile the solar system with molecular smileys to maximize a badly programmed notion of "happiness".
Machines are great, but we do need to mind the way we use them.