One significant driver in the need for more stuff is more and more people. More people than the planet can support. Something that the video failed to mention as one root cause in the need for more stuff.
George Carlin had a classic skit on stuff. It has a similar message together with humor.
YouTube - George Carlin Talks About "Stuff"
For all those worried at the moment about the world economy, just try and get the world economy going without more stuff.