Let me add to the Kodak story. A key player in their ultimate failure was Walmart. How so, you say?! Here is the story the way I got it some years ago.
Kodak was looking for a way to make the switch to digital, but they were "handicapped" from making the change by the fact that the film business had margins that were staggering, over 90% factory margin I was told. They could see that their film business would be dying. They knew they could only buy cameras from Asia and brand them as Kodak; making a competitive camera in the US would be impossible. After some halting efforts, they started to source some digital cameras from Asia to sell with the powerful Kodak brand; they saw no way to restructure the existing company around the much lower margins of digital camera sales.
At a weekly staff meeting involving the COO and the leaders of film and digital strategies, the film guy pulled out a letter from Walmart that essentially said, 'if Kodak continues to pursue its digital camera strategy, Walmart will be forced to change suppliers for its film processing business.' Fuji was in the wings to replace Kodak for that huge and very profitable part of Walmart's business. Kodak let that letter be "the last straw" and slowed their digital camera efforts. Later, Kodak focuses on liquidating in a way that would assure their pensions were funded, then closed down. Sad...but this is what happens with technology change is too big and too fast to follow.
Here's a bit of history on digital imaging:
History of Digital Imaging & Image Sensors | FORZA Silicon Corporation