It's obvious the author of the article hasn't learned anything from the digital revolution either, which is strange since they allude to it.

3D printers are in their infancy as others in this thread have stated, but they are starting with an open source ecosystem which only appeared later in programming and digital media. Now anybody can produce music, video and code with free tools using free samples and resources and share their products with the world however they see fit. Likewise people with 3D printers will only be limited by the current state of the open tech and the materials they can afford.

Just like with open source software and creative commons media the established players wont be able to stop the hackers from making. The only question which remains is how important these "hobbyist" trends become to the mainstream.