What's the most destructive force in the tech world, the thing that has nearly killed BlackBerry, pushed Dell to go private, and made a mess of Microsoft?
Conventional wisdom in Silicon Valley would finger one of the following technologies: smartphones, tablets, social networks, "the cloud," app platforms, or some other inscrutable bit of jargon.
Actually, though, the most destructive, unpredictable, and fickle force in the tech industry is much closer to home...
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