So what would a new system based on this new reality look like?
Most people sustain themselves using the money they get in exchange for their labor. Based on history and growing income inequality, no one seems to believe the next step is a Star Trek-like post-scarcity economy.
The "how will people afford X??" is an existential question. If human labor has no value and UBI is not an option, then what is going to happen to the people?