I think the argument is a bit flimsy. I can understand the idea of 'offshore English', where native speakers are taught to avoid excessive use of idioms and other culture-bound features of the language to facilitate international communication, but to say that they shouldn't be taught because 'many' are worn-out, ignores the fact that many more are not and others are coming into use. The pushing the envelope/waking up and smelling the coffee/thinking outside the box types that the article dislikes mostly seem to belong to the Orwellian language of business that has inspired Dilbert and B@llsh@t Bingo. I think that extending this to exclude all idioms is an unrealistic and rather pointless exercise.
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