You say that like the current models are the end of the line but understanding why film making techniques are used isn't impossible even just for a llm based system. Designing new styles isn't out of reach for ai either, sure you can God of the gaps it and say there's a mysterious sliver of soul required but practically it'll be able to be every bit as original as any human, probably more so as it has more knowledge to work from.
I know it's desirable to hate on ai because it's scary or popular but nailing your colors to the argument that it'll never be able to do certain things is already an exhausting game of moving that goalpost every time a new model emerges and that's only going to continue.