But what happens computers are as good as people in most of all the things that qualify as jobs nowadays?
Science fiction writing covers the two limit cases pretty well. Let's say machines can now account for all basic human needs, producing food, clothing, shelter, etc. sufficient for the whole human population. Then at the dystopian and utopian extremes, we have:
Possibility 1: These machines are owned by a small ruling class, who uses their control over this vast pool of robot labor to rule the world, and over the impoverished underclass who own no robots.
Possibility 2: These machines provide for everyone's needs, freeing up humans for a glorious age of space exploration, science, what-have-you.