Everything that is developed and added on to each new successive models will sooner or later come to a point where demand for something newer just plateau or slow way down. Why pay more when what you use functionally as a camera or whatever that product is fully satisfied? All product type will come to that point and unless something really revolutionary comes along to drive upgrading, demand will slow if not stop. Fanboy-ism will only go so far sometime especially if an economy is not doing well.
If we only see business numbers as something that needs to keep growing every year better then the less, you can not lost sight on where you have a market that is crazy or big enough to keep increasing those numbers. Sometime when you are already a big giant, being able to still attain the same figures, you might need to be happy that you are able to get to the same point. heheh.