I am a strong believer in strategic focus, however I have also personally experienced a case where an “openness” to opportunism turned the enterprise from a pedestrian company to a Silicon Valley legend. Ascend Communications was “focused” on ISDN based video conferencing with an OEM agreement with AT&T. However, AT&T came to Ascend and asked if it could solve a much bigger problem…dial-up access to the Internet over the voice switches was overloading them. 90 days later, Ascend delivered the solution, and the rest is Silicon Valley legend. The Ascend MAX became the global industry standard for dial-up Internet access, and the company the most successful SV company in 1996. So it always pays to keep your eyes and ears open.
From the Harvard Business Review, October 2012 issue.. http://hbr.org/2001/01/strategy-as-simple-rules/ar/1?conversationId=3309386