Funny thing is, when you look at the cost of installing and maintaining current gen industrial robotics it more often that not works out cheaper to just keep the current human workforce! Then if you had people operating machines previously, you can retrain them to be technicians for the robots. So their will be jobs for some of them.
This may change as robots become more advanced, but not likely for a long time. Especially when you keep in mind the fact that the majority of robots are just arms.
I highly doubt that people would starve or simply become state funded layabouts however. There will always be low level rubbishy jobs that will require a human presence.