An interactive narrative

Early on the writer says how, with help of computers, people could enter the movie and actually interact with the narrative, how this could be a potential thing. I'm sorry, but when I first read this I went, "oh,you mean a video game?". Contrary to maybe mainstream thought, but thats what a video game is , an interactive narrative where the story can be affected by the audience's participation via technology like that of a computer.  It makes me think if movies would ever even need to become interactive when video games exist.