Interactivity is in the gameplay, not in the story.
Of course, in the future, we can imagine game where the story will be interactivie and where u will drive the story mainly by yourself. But even here, u will have part defined by the game creator.
We cna imagine a game with 100 different end/story, this is still limited, and this is still dependant of the game creator since a full interactivity is not possible
(maybe the good question is not about interactivity in video game but more about "player dependance" in video games : what is define by the player vs what is define by the game creator?).
Time to Work !







