I would not say it is economic, it is rather in the nature of business.
Look at what brand product people were buying in the 1950s. Chances are you are not going to recognize much of them. People slowly stopped buying them until it made no sense for the business to keep on making the product and/or the company died.
For your company, it means that If your sales on a product are going down, it is dying, and you would better have something ready to replace it, else your company iself may be in danger.
TL,DR: In business, you are either growing or you are dying, hence why everybody always tries to grow.
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