Re: What technology is necessary
I think games won't have the same narrative capacity as books because they are a different format.
When you read a book you use your imagination to translate the information you are reading, how a character looks, how an environment feels and looks, the facial expressions, etc.
A game translates all of this into an image that you control with certain limits, you don't use your imagination anymore, this maybe happened in earlier games where you gave life to a realistic monster in your head by just watching a couple of pixels.
Apart from that, I believe some games are lengthy enough to give the kind of narrative capacity of books, these games are mostly RPGs or adventure games such as Skyrim or Heavy Rain.