Take artists, for example. Before they develop their own style, they spend years studying and imitating others. Their "new" ideas aren't really new, just different enough from what we remember to feel fresh. Sure, there are painting elephants who aren't "standing on the shoulders of giants," but their "art" is like saying, "Wow, GPT-2 finally wrote a decent email."
Even before AI, people were saying, "All the good music's been written," "All the great films have been made," "All the best books..." You get the idea. We're mostly just mixing and matching now, but that's exactly what AI does too.
So either we can't create anything truly "new" without building on our "old" stuff (which used to be "new" once upon a time), or generative models can create "new" things just like we do. Your thoughts?