I suppose it's good to have many options;multipalyer,co-op, single. But you're right they need to implement the more advanced AI in single player gaming. I imagine RD2 single player, where honour level has more effect and out in the open world it's much more random and interactive and like the real world, new interactions and new stories are happening everyday.
The shift I think is going to be, wheras a film is designed to have mass appeal and everyone views pretty much the same linear narrative.
With single player gaming it will be each player's unique experience, unique narrative and the game world generates around their protagonist. Which hopefully they have created themselves(even Skyrim did that).
Here's a light vid on topic>
View: https://www.youtube.com/watch?v=NPuYtHZud0o&ab_channel=TheVerge