I have a feeling that a lot of the issue revolves around the fear that an electronic device will be used to detonate an explosive device somewhere else on board.
Or using your phone to setup tracking for an outside source to down a plane..
Sounds like TSA idiocy. Totally lacking logic.
If somebody wants to do either of the above things, they can do it today. Think though this for a nano-second. How does the flight crew know if you turned off that gadget in your pocket?
Bottom line, I would bet a million ipads that there is at least one phone turned on in every single flight. People just forget to turn them off. Simple stuff.