It would require a lot of strong social structres. Because a lot of important tasks (like maintaining the floor cleaning equipment in the robot-tractor tyre factory) just really isnt that interesting but still needs to be done. I can see ways motivation can come from others. I'd argue my motivation to persist in my work isn't (directly) because of the money I am paid but rather due to social effects of my colleagues, and the money only contributed to building up this colleague social structure in the first place (alongside the potential value our work brings being an almost equally powerful motivator)
keeping these things going when people lose interest will be a challenge.
> a lot of important tasks (like maintaining the floor cleaning equipment in the robot-tractor tyre factory) just really isnt that interesting but still needs to be done
In a heavily AI-oriented future, why wouldn't that be done by the floor-cleaning robot?
Some people do a job for the pride of it because it must be done. I wouldn't want to be a plumber, but that doesn't mean there aren't plumbers who take pride in doing it. Same with the floor cleaner at the robot-tractor tyre factory.
Though I suspect on a long enough timeline, that job will be automated too and UBI will become a "here's a [weekly|monthly] stipend to live life on, but it's not too much to act truly foolish with."
keeping these things going when people lose interest will be a challenge.