The killer application for AI is to enable expert profiles in enterprise and productivity applications. These are not bots that help you get through mundane tasks, these are profiles that application consults to provide assistance in using the application. This is akin to expert levels in gaming.
When using - say - an IDE. Today, the profile that the application stores on the user is mainly to collect credentials and secure access to outside storage and other artifacts. With GenAI, these profiles can be based on other users, experts or just AI itself. If you admire writing style of someone, then assuming the person is willing to sell/share their profile, one can use that profile (import it) and the application can now use the profile's style to generate your content.
IDE is the easiest to understand this concept, but you can imagine how intelligent profiles can be used in every sphere where applications perform majority of the mundane tasks. For example, the world's best trader can export his/her profile in stock trading and you can use if in your brokerage application to receive recommendations for trade which otherwise you would not have entered into as you would not have seen the opportunity.
All of this is essentially creating a alter ego of yourself. Now everybody can become a rock star!