Anyone who believes in the possibility of post-scarcity society must be either naive or trolling. Something cannot be made from nothing, therefore scarcity cannot be overcome, even assuming that all planning and execution is performed by superhuman synthetic minds.

Assuming that it's theoretically possible to utilize existing resources in a very efficient manner (e.g. motor running on a grain of rice for a century) and we just need AI to help us figure it out, is a _gigantic_ leap of faith and i would not bet a cent on that.

Let me paint a more realistic possibility for you (with a broader time horizon): most of the value created by automating knowledge work will be captured by private capital, and middle class will all but disappear. Education beyond basic reading and writing will become unattainable (and, frankly, unnecessary), most population will be reduced to the state of semi-literate serfdom dependent on the newly minted lords for survival. The lords wouldn't have to worry about feeding their subjects for too long though, as mass death brought about by climate change will take care of that problem.

Under that scenario, there will be no new enlightenment age to come and save us. The only reason we get to enjoy whatever freedoms we have today is that a (semi-)intellectual population is absolutely necessary to keep the complex modern economy running. Even then, those above you will do absolutely everything to limit your agency - by withholding information, lying, or just outright taking freedoms away. Do you know what happens once our participation in propping up the economic machine becomes unnecessary? Demotion to the default state of a human throughout history - a groveling, suffering serf who has no idea what's going on.

"If you want a picture of the future, imagine a boot stamping on a human face – for ever."