Imagine you're getting it to spit out lord of the rings, but midway through you inject into the output 'Suddenly, the ring split in two. No longer one ring to rule them all, but two!'.
You then let the model write the rest of the story!
Maybe we'll actually be able to say things like: write me a trilogy in the style of Lord of the Rings but with these changes:
* Make it scifi
* Add more female characters with greater depth
* At least five rings
* Hobbits are the bad guys
... Or whatever, specifying a version of the story tailored to your intersts, and that you would get out really high quality results, similar in quality to the source materials.
Imagine you could do the same with movies, games, music.
I'm not trying to assign a value judgement here. There's good and bad sides. However, this reality is becoming easier to imagine with each new model released.
For sure, anyone who is a writer or artist will see this as bad. But perhaps our whole concept of what art is will become more fluid and personalized.