Any business that remains stagnate, dies. You have got to try new things, go into new territories, diversify. Yeah, there is always something to be said for building up the "core" whatever-you're-into. But if that's all you do, you miss too many opportunities. Plus you're prime to be hit when (not if) that market falls out.
Hmm. Just thought of a shorter way to say all that: Businesses are sharks.