That's pulling the cart before the horse.
Economy is not supposed to be some natural force that people and states have to obey. It was supposed to be the result of conscious, deliberate action, by the people (and their organizations, representatives etc), to advance their means of living.
So, "economy will only need the top 10% of us" means: we are not in control of our state, we are merely slaves and resources to be used as it pleases some outside force.
Which goes contrary to the very notion of democracy (as it was developed in ancient Athens), which was all about empowering people over external forces (Gods, nature, the will of the King, fate, etc).