You are repeating standard argument of the Luddite fallacy's supporter. But its not the law of physics that guaranteed to last forever.
You haven't countered that argument with anything but a lack of imagination. Just because you can't imagine the ways the jobs will change to evolve and adapt to a changing society does not mean it won't happen.
Neither facts or logic have been brought to bear here. Your imagination that jobs will change in a way which provides something like full employment (if you even do so imagine) does not lend credence to that view. He countered the argument by observing that it was without foundation. You countered that argument with your imagination. If the foundation is your imagination, I wonder how much load it will bear. Will it withstand a storm of empirical evidence, or an earthquake of logic? If so, is it a monument or a blight?
If anything, we're seeing fewer millionaire "rockstars" but instead regular people making smaller amounts of money individually, yet in much greater numbers.
Amounts of money inadequate to alleviate abject poverty in almost all cases. Not relevant to the question "how will people survive". Relevant, perhaps to the question "how will wealthy people self-actualize".
Centralized solutions to wealth inequality are pretty terrible in their unintended (sometimes intended) consequences. Decentralized mechanisms have been offered; often in the alt-coin space, this goal is pursued, if never adequately. A (1) decentral structural change which creates enough incentives to gain viral opt-in, without (2) creating a new kleptocracy, and (3) facilitating enough dispersion of wealth to enable humanity to avoid dystopic outcomes, seems desirable to me. Bitcoin offers the first, but does nothing to address the remaining points.