If we introduce UBI it would probably be one of the first times in history that society addresses major changes without war, revolution or other upheaval. My prediction is that inequality will grow, a lot of people will lose their jobs, but nothing will change fundamentally without a major conflict.
We see that already with climate change. There clearly is no will to really address the issues. We'll have sea levels rising, millions of refugees and somehow deal with that. We will not prevent that.