I suspect the plan is not “make 6T revenue by having AI add >6T value in new and improved software”, but rather it is more like “make 6T in revenue by having AI substitute for ~6T cost or human labor”.
Not true due to induced demand. Traffic increases when more lanes are added to a highway. The alternative to $200 in AI costs is not $20,000 in labor costs. The alternative is nothing because the work was never worth $20,000. So the AI did not eliminate $20,000 worth of hypothetical labor.
AI creates demand for things that didn't exist previously
