I disagree that wealth is limited (we can mine an exhaustless supply of minerals for instance). But he nails everything else.
After re-reading your comment, I realize I think I misterpreted this sentence. He's not saying the total future value has already been created, he's saying the past value was worked for
Humanity is headed towards shortages of many critical metals, such a copper, within this century, with consequences on price and availability already felt and predicted to be a major geo-political issue within a few decades
That's also the other side of it: we're short better wiring materials/technologies because copper is 'good enough' at it's price point.