What will happen to humans displaced by these robots? We live in a society that expects everyone to work, but what will happen when there are no jobs? Crime? Extreme poverty? Mass protests? Political or religious extremism?
Probably all of the above, to some degree... but there's still huge differences between Russia 1917 and Greece 2017. Maybe Venezuela is getting close to the "fuck it, I got nothing to lose" level but as long as society is keeping people from really hitting rock bottom I think most poor people will simply be poor. Absolute poverty is in strong decline, the "third world" isn't nearly as primitive as it once was, even if the US middle class has been stagnant since the 70s the world hasn't moved backwards. Just like if global warming kills the Gulf Stream some places can get colder, not warmer - it's the big picture that counts.
Consider it this way, even if you're really poor the OSHA won't let companies kill you at work. The FDA won't accept dangerous food, you probably have clean hot and cold water, decent sanitation and so on. Medical science moves forward, people live longer and longer. Building codes keep getting stricter, cars safer and my impression is that people throw more and more away because they don't like it anymore or it looks a bit shabby, not because it's broken or useless. If you just accept being a bum and collect cheap or free second hand stuff from thrift stores and flea markets and eat Ramen noodles you might not be living it up by today's standards, but it's nothing like being genuinely poor 100 or 200 years ago. Or the worst hellholes today.
So 43 million Americans are on food stamps today, if we get (more) robotic tractors, robotic delivery vans, robotic shelf stockers, robotic checkout counters, robotic this, that... people go out of a job, some get new work others go on welfare. And if you think that's a problem, you can always replace one bulldozer with 1000 people with a spoon... it's not worth creating jobs just to have jobs. Expect it to be just barely enough to calm the masses though, it won't be given freely or easily. But I doubt they'll let it slide so far that people take to the streets with "give me UBI or give me death" slogans, there's always the "viva la revolution" or "Soylent Green" endings. But I think "bread and circus" is more likely.