I was thinking of qualified accountants and marketers who later finish an MBA program. It's not a useless degree, so long as it's paired with useful skills (i.e. not a BA who switched from a BSc, BE or BBA program because they couldn't hack it) and the bearer of that degree doesn't become an incompetent bullshit-spewing PHB. (It's acronym-soup day!)
I agree with your second point. I was thinking in terms of the car industry in the linked article. A company's top position should be filled by someone who's specialized in that company's field.