Complacency is the state of being content with achievements while simultaneously being unaware of the pending dangers.
One of the greatest risks successful Lean companies face is complacency. They make massive gains, and become highly competitive in their markets. Then they become complacent and rest on their laurels while the competition makes progress.
Many companies embrace Lean in a time of crisis, but when they are out of the woods, complacency sets in. The key is to create a culture where continuous improvement becomes a way of life.