I don't think we should fear the big corps shrinking over night.
What we should fear is the startups.
Legal startup demonstrates they can do legal work at a fraction of the price. New generation of banks can underwrite at a fraction of the cost, or new insurance companies can insure much cheaper.
This will force the incumbents to reduce head count and use Ai.
fair point, that said that's a first phase only, if llm/ai keeps growing steadily it's in theory able to do 90% of non manual labour jobs (and robots are also improving so.. even manual labour may evaporate)