Not OP, but if China takes up labor and manufacturing automation with robotics in a big way, there are a LOT of people there that will not have much to do anymore ....
Same can be said for every country right now. And now, there's fewer and fewer reliable greener pastures that unsatisfied people can go to, which used to let off some much needed steam.
The people will always have something to do. What those somethings are is entirely up to the ruling class.