...And also leave the people who own companies that see those "productivity gains" massively richer, explicitly at the expense of the people who are now unemplo

...And also leave the people who own companies that see those "productivity gains" massively richer, explicitly at the expense of the people who are now unemployed. We are seeing in real time right now what happens when inequality grows too stark. The people at the top abuse their disproportionate financial power to capture the government, and then start ensuring that the government can never threaten their economic dominance, regardless of the consequences for the 90% of people who do not share in it. There are a number of potential solutions to this. Many of them involve violence. Among the least violent are various forms of UBI.