My point is that contained within Boeing or GE are several people who are probably far more capable than the usual suspects from the incestuous circle of Yalies or HBS graduates they usually choose from. The CEO should always come from within.
I don't know if that's true anymore. Maybe in the days when people stayed with a company for 20 or 30 years, but today there is such job hopping that moving up the ranks of a company to the top spot is a rarity.
I do believe CEOs should have an expertise within the industry, but I remain unconvinced that they should have spent an entire career at a single company.