What does this case teach you about the need for constant change in marketing?

[jodichilders]

Staples and Office Depot also use the services of United Stationers. These superstores order in such large volumes that they buy most of their products directly from manufacturers. However, there are many products that are not very popular but that superstores must carry in order to become one-stop shopping centers for office supplies. Since ordering these products directly from the manufacturer is not very efficient, the superstores turn to United Stationers. Untied Stationers also supplies many of the office products that get sold online by Dell Computer and 125 other companies.
What does this case teach you about the need for constant change in marketing? Does this case indicate that intermediaries are becoming less or more importain marketers?
What do you see as the future of online marketing in general and "business-to-business" online marketing in particular?
I need as much answers as possible by Friday ! Please help me!!!