UBI effectively means welfare, with all the attendant social control (break the law lose your UBI, with law as ever expanding set of nuisances, speech limitations etc), material conditions (nowhere UBI has been implemented is it equivalent to a living wage) and self esteem issues. It's not any kind of solution.
Most people want to do anything but these three things - society is in many a ways a competition for who gets to avoid them. AI is a way of inexorably boxing people back into actually doing them.
Either way, governments need to heavily tax corporations benefiting from AI to make it possible.
That's still an if and also a when; could be 2 decades from now or more till this reliably replaces a nurse.
> Retraining to what exactly?
I wish I had a good solution for all of us and you raise good points , even if you retrain to become say a therapist or a personal trainer the economy could become too broken and fragmented for you to be able to making a living. Governments that can will have to step in.
That said, it'll certainly get much, much worse before it starts getting better. I guess the best we can hope for is that the kids find a way out of the hell these psychos paved for us all.
If you think those in power will pass regulations that make them less wealthy, I have a bridge to sell you.
Besides, there's no chance something like UBI will ever be a reality in countries where people consider socialism to be a threat to their way of life.