Because any job it creates it can automate as well, for example a lot of people here think that understanding how AI models operate internally or being up to date with the latest models will save them from making their jobs obsolete, it will not, AI itself will be better than you at picking the next model to deploy, at testing the speed of reasoning that beats it's own. Anything it will need to learn it will learn it faster than you with the ability to handle much more complexity than your brain.