The reason why this is so disruptive is because it will effect hundreds of fields simultaneously.

Previously workers in a field disrupted by automation would retrain to a different part of the economy.

If AI pans out to the point that there are mass layoffs in hundreds of sectors of the economy at once, then i’m not sure the process we have haphazardly set up now will work. People will have no idea where to go beyond manual labor. (But this will be difficult due to the obesity crisis - but maybe it will save lives in a weird way).