Nothing is sustainable. This is a concept invented to thwart questioning the environmental impacts of industrial activity. "Oh we can do it 'sustainably'".

To claim AI tools will strip out the wealth of the middle class and cause unrest can be disproved by the fact that it was beaten to it by the US corporations by over a generation.

The "middle class" was an invention of post war US to reward the soldiers who fought in Europe and the Pacific. Things are just reverting to a more long (as in multiple centuries) trend behavior of economies. Few haves, lots of have-nots and barely anything in between.