A perfect example has just arisen. United-Continental Airlines CEO has just stepped down and replaced by Oscar Munoz. Munoz has no background in the airline industry, but he does have a background in the railroad industry. Both industries are highly comparable due to logistical systems, government oversight, unions, etc. However, what do you think the people of United would think if someone completely inexperienced in the field of transportation (let's say an executive from Barnes & Noble) were hired as CEO? I'm quite certain there would be some disgruntled employees from management to pilots to mechanics to ticket agents. It's certainly possible the B & N CEO would be very good at the job, but it wouldn't be readily apparent from the get-go.
Do you realize that IBM hired him from Boston Market??? This is exactly the scenario you are claiming causes so much consternation. And he hit a home run with IBM I might add.
And people within the academic community need to get over themselves. It's not really that complicated or unique in academia that a good leader from the outside can't be successful at managing the organization/s. If anything - the incestual relationships within academia is one of the greatest threats to the future of quality education. And outside perspective is an absolute must at times.