Because one of the primary goals of using AI for companies is to pay as few humans as possible for the same amount or more work, or preferably pay no humans at all, because that makes them more profit.
So it does not follow that companies can bank the savings from firing people. Anything AI can do for me it can do for my competition as well, and humans still make the difference. The big question in the AI age is "why pick me?" why hire me, why invest in my company, why buy my product, in a sea of similar products made by everyone. A differentiation crisis accentuated by AI.