It'll accelerate phablet sales. If there's only one device allowed per person on-board, might as well try to get the most done with your phone (and bluetooth keyboard).
Or the government mandates that prior to boarding, you've got to place your phone/phablet device in an EOD containment chamber along with everybody else's device, which sits in the cargo hold.
It sounds absurd, but then again most of what we have to go through now at the airport is, compared to what took place prior to 9/11.