I think the answer to this question is very simple, even if it does sound a little egotistical.
Because we don't have to.
There is no real reason to make a full change to metric. Science and engineering already use it, but the general public really has no need for any change when the system we use works just fine.
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"Final thought: I just rented Michael Moore's Bowling for Columbine. Frankly, it was the worst sports movie I've ever seen."
--Peter Schmuck, The (Baltimore) Sun
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