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Well, considering that ever since September 11, 2001, the government's strategy has been to do exactly what the terrorists want every time, it seems likely to me that DHS will indeed adopt this technology. Then, as you say, the bad guys will just have to figure out how the thing works, and they'll be able to hold a plane for ransom pretty damn easily.
Personally, I hope they do adopt it. Since it would likely be the straw that breaks the camel's back for the majority of flyers, I figure it would be the end of the whole fucked-up pile of sewage that the commercial airline industry has become. Then perhaps we can build something sane and usable out of the wreckage.
Me, I've sworn off flying. There is no trip that is worth putting myself in the hands of these petty, tin-plated dictators. I'd rather take a vacation train to San Francisco than fly anywhere. Fuck 'em. Until sanity has been restored, I'm staying on the ground, and good riddance.