If the reason Kodak failed is because they failed to see the shift in attitude towards photographs, then why is it that traditional camera makers like Canon and Nikon are alive and well?
I think the writer failed to see the obvious here. The reason Kodak failed is because Kodak is primarily a film and photo chemicals maker and not primarily a camera maker. With less people using film it is obvious Kodak can't base its business model on an obsolescent technology. Nikon and Canon are primarily camera makers and they were able to make the shift to digital successfully. Kodak was not.
Kodak's error was that it decided to hold onto a flawed business model rather than just closing down the company and returning the assets to the stockholders. Some companies are destined to close down. It's just the way it is.