The hope is that increased human demand that goes along with it will create separate classes of jobs. And to be sure, some economists think so: http://economistsview.typepad.com/economistsview/2015/02/robots-arent-about-to-take-your-job.html
Now clearly, if AI gets as advanced as some of the alarmists say it will, then no economic system has a chance of working and loss of jobs will be the very least of our issues.
Between automation (which is now hitting not just manufacturing but also starting to crest into transportation) and 3D printers I think the game is changing drastically. If these technologies continue on the path their on a significant portion of the retail life cycle will be rendered obsolete in a decade or so. Technology is a force multiplier, it allows a higher standard of living with less effort. Previously it still “made” jobs because of the higher standard of living, it gave us more stuff to make so we still needed lots of people to make it. But the new techs coming in are dropping the effort level extremely far extremely quickly. When most of what you order from Amazon goes straight to your printer the game will have changed drastically and the number of workers we will need will drop like a stone.
Imagine all of the people who have been brainwashed and forced into ignorance suddenly having access to a super smart AI able to show them what is true and what is false! It would be an instant revolution leading to a world ruled by an incorruptible benevolent AI able to bring liberty and justice to everyone.
In fact the tech may already be here but is being held back until it can be programmed to lie and ignore evidence while still appearing to be fully logical.