There has always been a small percentage of aristocrats in society who do not have to work because of their amassed wealth. Looking at how they spent their time is probably a decent indicator of how most of the population will spend their time 50-100 years from now. My guess is most people will put far more effort into their hobbies, and many of those hobbies will turn into part time jobs. All basic and even most non-basic needs will be covered by social welfare programs paid for by publicly owned mostly-automated industries. People will only work because they want to, and the very few undesirable jobs that can't be automated will pay excessively well.
At least that is the best possible outcome. Their are plenty of dystopian possibilities as well.
AI replacing jobs is fine - as long as they're getting rid of grunt work jobs people hate doing and replacing them with higher quality, higher paying jobs that are more challenging.
Crap work jobs are the kind that offer no form of mental or physical stimulation or physical challenges that generally embody "good work". Physically demanding jobs like oil rig workers, (crab) fisherman, etc., appeal to few folks who really do enjoy the physical punishment and pain for a challenge they can do with their hands, while more creative industries like technology and culture appeal to those who wish to use their mental powers.
Crap jobs AI can probably take over would be stuff like janitorial work, simple assembly line style work where there is no physical challenge other than repetitive-strain injury and barely any mental stimulation.
As for the outcomes, unfortunately, the masses who toil will be the ones out of work and homeless while the rich buy up the land. Money is power, and power is not something that an AI really replaces. (It's actually those in power that will use AI to replace jobs to save on labor costs. The former employee is now jobless and has less money and thus power than when they were employed).
That's not to say it isn't impossible to have a place where humans are able to do work for the betterment of humanity than just toil around, but it needs to be a carefully designed and planned environment.
See Marshall Brain's Manna.