Harvard professor or not, he simply coined a term to refer to a new technology deprecating an old one, so much that it becomes the new market that companies compete in. Yes, the iPhone did that. Where's the debate -- it's a fact that everything became 'touch' since then. The term 'disruptive' just cheapens the discussion and brings it to a baseline level of 'startup culture' drudgery. The term is used so often around here that it's become something of a pseudo-intellectual discussion starter.