Custom AI commercials would be very interesting. Instead of seeing strangers enjoying the benefits of the product, it shows you. A car commercial would show you driving, etc.

Commercials and TV episodes could have a basic "story arc" and then completely customized to the viewer.

Think about the simpson's or something. Imagine that the story of the episodes were kept, but you could swap in the characters and locations. So for instance if you lived in Nashville TN, all the simpson's episodes could be generated to show the settings as Nashville instead of Springfield.

Then you could have the AI switch out the characters to be people you want. Maybe you want to replace Lisa with an AI Simpsons version of you. Mayor Quimby with Nashville's actual mayor, etc.