We don't accept worms in our meals, we don't accept meals that are missing half the portions. Yet we expect plot holes, we expect stories that don't complete, or get hastily completed.
Most written stories suck, because it is incredibly time consuming to craft an interesting AND airtight story. Most writers resort to cliches, because cliches are 10 times faster to write. Writers resort to 'plot beats', because they are 10x easier to execute than letting character motivations and world events naturally play out. Just look at Game of Thrones, the book is original and natural, so it takes decades for 1 book. The show decided to make it fast, and we get an atrocious ending.
AI will change this. Writers will be come directors, directing the AI-simulated characters in their stories, guiding the world states. Writing becomes outlining the general plot, background setup, and themes of the story, and then the characters come alive via AI, and the story begins! With 10x faster iteration and experimentation, the quality of the stories will start spiking dramatically up.
This is the biggest change to fiction writing since the printing press. Novels will merge with comics (given images are cheap now), video games will have genuinely massive story branches (given stories can be iterated quickly), they may even have NPCs that are simulated via AI.
Fans will be able to write a proper conclusion to the Song of Ice and Fire, with AI-assisted writing. Even niche fantasy novels can get LOTR level adaptations etc.