A couple of things immediately come to mind:
From a coporate standpoint, if you automate things you increase profitability- but competition will ultimately drive prices DOWNWARD. As he points out in the article, the fast food industry is striving for the bottom in terms of worker salaries. Part of the reason for that is the saturated and competitive industry, where there a dozens of competitors in your segment, so every penny probably counts. So what happens is suddenly you have this huge profit margin from the elimination of worker salaries (save a 1 time feee per robot/cost of maintenance, etc) and so now you can sell a burger for 25 cents and still make huge profits. And as soon as BK does that, Mickeys is force to follow suit, and then the rest of the business, or they go out of business.
Secondly, if there are no jobs, then there is no income keeping the economy revolving. I'd imagine the government would be forced to step in and raise minimum wage drastically, and take steps like a "human" affirmative action plan, to prevent a collapse. Think of it this way- if half the country's unemployed, who can afford to buy any products? Companies would indirectly be putting themselves out of business. If anything it will drive down wealth. After all, the goal of automation is eliminating all work. If we have robots to make our clothes, grow our food, build our shelter, and maintain our systems for us, why do we need money?
Simple: training and education will move employees to other sectors- progress in science and technology means evolution of jobs to a more "knowledge-based" society. Maybe the entry point for the job market becomes a bachelors degree, instead of a HS diploma. And with automation, people are freed from many societal restraints to focus on education, arts, and self development.
Imagine you didn't have to get up and go to work because your robot did all of your chores, robots made your house for free, robots made your clothes, grew/made and delivered your food, robots make the cars, maintain infrastructure- so there's no longer a monetary cost associated with any of these things. Even robot maintenance is done by robots. A few "overseers" manage any issues, but otherwise it's fully automated.
So what would humans do then? if no one had a job to go to, had responsibilities beyond the very trivial? Can you say the next rennaissance ? Art, literature,science, technology could all grow exponentially because people would be free to pursue their true interests instead of laboring to provide basic lifestyles.. in essence it would be the top of Maslow's pyramid- a utopic society.
Of course that's assuming we don't all nuke ourselves, get eaten by gray goo, or get eliminated b the robotic singularity
