We don't even know what kind of society we could have if the value of 99.9% of peoples labor (mental or physical) dropped to basically zero. Our human existence has so far been predicated and built on this core concept. This is the ultimate goal of AI, and yeah as a stepping stone it acts to augment our value, but the end goal does not look so pretty.

Reminds me of a quote from Alpha Centauri (minus the religious connotation):

"Beware, you who seek first and final principles, for you are trampling the garden of an angry God and he awaits you just beyond the last theorem."