I'm not sure you could back that up with case studies. Most companies are disrupted because they focus too narrowly. They also tend to think they're in the "too

I'm not sure you could back that up with case studies. Most companies are disrupted because they focus too narrowly. They also tend to think they're in the "tool" business when they grew successful as a solution business. E.G. Whip and Buggy company think they're in the buggy business, get disrupted by a company that thinks they're in the transportation business.