In the anatomy of a financial services organization, software is the circulatory system. It picks up the data in the brain, or database, and delivers it to where it's needed. It connects all the parts of the body together and ensures the body is working well as a single entity.
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.