Just looking at consumer photo, digital photography RADICALLY decreased the cost of taking usable pictures. I used to take hundreds of film pictures in a year. The expense was terrific, and you got ten you didnt want for one you did, if even that. Now you can take hundreds of pictures in an afternoon, and you only need to pay to print the ones you want, AND you can send them to friends, include them in documents, reports, etc. Kodak not only failed to cannibalize themselves, they failed to consider the value of this innovation to their CUSTOMERS, and it was only a matter of time before others did.