I'm a bit amazed by this threads overtone. Woe is us, the sky is falling, Trump's an idiot (well, definite possibility admitted), the authorities know nothing, batteries will explode, etc, etc.
I was of the impression that these measures were in direct response from "credible" intel. UK even stated they were privy to the same intel as the US and after reading all the posts in this thread, I can't recall anyone stating the intel is false. Without getting into a "Iraq had no WMD's so intel can't be trusted" debate, I tend to think that due to the worlds mongrels who think mass murder is a simple political/ideology statement, all of us do have to pay a price. So what if we can't have a laptop to keep up with the latest saga of Desperate Housewives, or some equally riveting drivel. For me, air travel is all about safety over entertainment value. For those that "need" to work on the trip, rubbish. You need to manage your workload better and for those that argue the gear will be damaged or stolen in transit, then invest in more robust cases and ensure your gear is covered by your insurance policy. The world is full of lunatics I'm afraid and if I have to pay a price, I'd prefer that price be paid by loss of entertainment rather than loss of life.
The upside of course, may be that airlines might stop ripping out IFE and start seriously considering upgrading IFE to a hybrid model with computing/wifi facilities for those who "need" to be tapping away furiously at a keyboard. I find these measures infuriating, but not so much because of the measures themselves, but because they're deemed to be needed in the first place!