One of the biggest problems for the current crop of gadgets, as outlined in The Digital Camera Fights for Survival, is that to keep people buying the gadgets, you have to continue giving people reasons to do so.

For example, I've been using my mobile phone for four years - why didn't I upgrade? Because I couldn't see a reason to do so. Even now, the only reason I upgraded was because my original phone was going wrong. Hardly a compelling reason for everybody. The same is true of Digital Cameras. My old one was 3 years old before I replaced it recently, and I can't see me changing it any time soon.