Name a product in the decline stage?

It depends on the reason it is in decline. Consider the auto industry, they have done pretty terrible at handling the decline in fuel supply. It is simply bad business to refuse to innovate to make the product fit the market. Then consider Motorola, there was a point at which the pager was their largest revenue resource, then texting was introduced. It is most important to look at the issue from as many angles as possible. Should the product change, die, or will the market always be there and this is just a rough patch?