Do you really believe that the rich who could share a lot right now but refuse to do it are going to suddenly start sharing in an AI/robots future? The more likely future is of a dystopian version where the wealth concentration is even higher with AI and robotics, and almost nobody has a job and is fully controlled by UBI and social credit score.

Yes, AI could eliminate many jobs. But I don't see it as something so dramatic.
All technological advancements have eliminated jobs. But, over time, this social impact is no longer felt, because new things emerge and require people. That's how it was in the past, and it won't be much different in the future.
Take the Industrial Revolution, for example. Many people who manufactured things manually lost their jobs. Tractors took people out of agricultural work. Among many other things. But then mechanics and other professions had to emerge to maintain this entire industry.
Of course, robotics can eliminate a lot of manual labor. But, surely other jobs will emerge where it will become clear that robotics is not the ideal solution.
There will always be a shock, especially for that active generation, which is caught in this job transition. But, later on, the children/young people will just be learning the new professions and, over time, this impact ceases to be relevant.
Unfortunately, once again, the poorer "third world" countries have suffered the greatest impact. But this is not the first time, because in previous technological leaps, they were also the ones who suffered the most.