Will they be complaining "robots are taking my job?"
I certainly hope not... this is where we need robots, in the sh*tty repetitive boring tasks that are so far just difficult enough that no one's spent the money to make a robot do it. - not stupid crap like "can we deliver potato chips by flying drone?"
But in unrelated topics, there used to be "mule spinner's cancer" where oil from cotton mule spinner machines hit workers in the crotch on a constant basis and turned out to be carcinogenic.
File that under "they used to do what?" that hopefully things like warehouse-stock-fetching will be filed under with a "that was before they had robots" tag