I don't think there will be much of a difference, as far as the mass entertainment production is concerned - it's already soulless and driven by divisions of marketers analyzing every single line to maximize the amount of people it will be entertaining for. It's not creative, it's just psychologically designed to exploit years of psychology research about engagement, and create something that is mass-appealing and entertaining, without care about any kind of artistic value.

By replacing the poor writers who are forced by marketing executives to dumb down their script to engage as large audience as possible with AIs, they will have a change to start building a new indie scene instead of getting their passion for the art sucked out of them by marketing research. That is a good thing, because they will have more freedom to create, not driven by the only goal of making as much money from as much people as possible. Let the mass entertainment create the same soulless bullshit with AIs, which they will definitely do to reduce costs, and let's hope that it will be the starting point for larger independent scene. It will keep the people who enjoy the kind of content for the masses entertained, so they will keep generating money, but without ruining the passion of so many artists by forcing them to create such content.