For a person to use something, they almost always have to believe they have something to gain. For a CRM system, that means that a person should get more information out than they put in. After all, if all you have access to is the information you entered, what’s the point?

So when a system stops receiving support or development, it affects the health of the entire company. It can become expensive to maintain, difficult to upgrade, or so obsolete it risks pulling the company behind the competition. When people can't or aren't using the system, or when the system isn't able to provide the functionality that's needed, the organization must replace it.