I see three possibilities if AI is able to eliminate a significant portion of jobs:

1. Universal basic income, that pays out based on how productive the provider side was per person. Some portion of wealth is continually transferred to the owners.
2. Neofeudalism, where the owners at the time of transition end up owning everything and allow people to live or not live on their land at their whim. Then they can use them for labour where needed or entertainment otherwise. Some benevolent feudal lords might generally let people live how they want, though there will always be a fear of a revolution so other more authoritarian lords might sabotage or directly war with them.
3. Large portions of the population are left SOL to die or do whatever while the economy doesn’t care for them. Would probably get pretty violent since people don’t generally just go off to die of starvation quietly. The main question for me is if the violence would start when the starving masses have had enough of it or earlier by those who see that coming.

I’m guessing reality will have some combination of each of those.