What kind of strategies can a company like HD develop in the face of a shrinking core customer segment?

As an illustration of strategy and/or and execution that refocuses a company on its core competencies, especially in the face of rapidly evolving external events and environments.
What kind of strategies can a company like HD develop in the face of a shrinking core customer segment? You may wish to build on the strategies discussed in the case already, but also expand on them or provide alternative ideas for continued or sustainable growth in their markets.