Scarcity is an illusion.
You are wrong. Scarcity exists. Maybe not of raw materials, but of things that exist against entropy. Whether that is organized movement of things or physical objects, or even ideas. You cannot make it otherwise. That this is the atom of your argument shows that your whole argument is wrong from the very start.
What can be made to be less scarce are the raw materials and shelter needed to survive and prosper from day to day. That will not happen due to some whimsical Keynesian manipulation of the money supply, but from technological advances. Furthermore, whoever invents the technology that can make this possible will profit wildly even as humanity as a whole benefits. Will they be richer than the majority of the population? Sure! But everyone is better off than they were.
I'm a bit miffed to see all of this communist-type claptrap springing up around bitcoins. Please have a look into agorism and anarcho-socialism if you haven't already, they hold much greater promise of achieving the ends you want, and Bitcoin can be a major piece of the agorist strategy.