Greg Satell, author of "Mapping Innovation," has a good blog post about disruption that seems particularly relevant to CPAs and other professional services.
(See Infographic: Three Disruptive Forces Upending The Accounting Industry And What To Do About Them.)
You can read the entire post here, but the first two paragraphs really drive home the point that
most companies focus on
doing what they do better, which is good for the short term, but also need to focus on adapting what they do because that's the only way to succeed in the long term given the way customer needs change.