The Economist's Schumpeter column cuts to the heart of AI's existential commercial challenge: model-makers like OpenAI and Anthropic aren't yet generating returns that justify their valuations, so they're pivoting into consultancy — the very white-collar world their founders publicly disdain. Accenture, which has 30,000 staff training on Anthropic's Claude, has lost half its market value this year as investors question whether traditional consul…