Yes the prices would plummet but that means wealth per capita increases in real terms. Producing the goods and services that depend on those cheaper commodities

Yes the prices would plummet but that means wealth per capita increases in real terms. Producing the goods and services that depend on those cheaper commodities will become much cheaper. If we get to a world where everything of value today costs $1 to produce tomorrow, that’s a much wealthier (non zero sum) world.