This is part of what the original UBI concept was about.
If this doesn't happen, yes, there will likely be violence until it is fixed.
The other view is that many technologies that were supposed to reduce work actually net added work, because now more sophisticated tasks could be done by the humans, so the net was similar to the highway paradox where more and wider highways breed more traffic by induced demand.
Where would this demand come from? IDK, but at least initially, these LLMs make such massive errors that keeping a lid on the now-hyper-industrial-scale bullshit[0] spewed by these machines will make many more full time jobs.
Seriously, just today I was amazed at how the GPT model tried to not only BS me with completely fabricated author names for an article that I had it summarize, but it repeatedly did so even after being successively prompted more and more specifically to where it could find the actual author (hint: right after the byline starting with the word "Author". It just keep apologizing and then doubling down on more fantastic lies, as if it were very motivated to hide the truth (I know it's not, that's just how fantablous it was).
[0] Bullshit being defined as speech or writing telling a good tale but with zero regard to the truth or falsehood of any part of it — with no malice but nonetheless a salad of truth and lies.