There are many jobs that exist simply so that people will be working, and there are countless jobs that will go away, bots are already taking over the current workforce. UBI may not seems to be a perfect strategy and full employment sounds like an elusive goal it is really difficult to put forth what this ride will be like.
As George Dyson wrote, “In the game of life and evolution there are three players at the table: human beings, nature, and machines. I am firmly on the side of nature. But nature, I suspect, is on the side of the machines.”