I have mixed feelings about this article. On one hand, I agree with most of what he says. On the other hand, David Cage doesn't practice what he preaches, and on top of that, doesn't respect videogames as a medium. He even wants to rename 'games' to 'digital entertainment'.
What does that even mean? Technically, a Pixar movie is digital entertainment. It's a meaningless phrase, unless you count the fact that it isn't the word 'games', thus freeing him from the need to respect the medium.
Heavy Rain wasn't trying to be a game, it wasn't trying to play to the strengths of the medium, it was simply attempting to be an interactive movie. It was still a game, but it was a game that largely attempted to ignore the strength of the medium.
If you want to grow up, make games that are more than just jiggling the sticks to effectively turn a page.