I'd like to see the original study also. Aviation Week shows them sticking UWB devices in the aircraft nose. Not a typical scenario. Any radio frequency device cranked up with enough power will cause interference. But, for now, just keep transmitters turned off in the cabin, including UWB (when deployed commercially) and Bluetooth, as is done now with cellphones, etc. Don't need UWB to use a laptop stand-alone.
I see a significant amount of text pager use in flight. But, hey, if you are not going to enforce the seat belt sign and 2-bag carryon rule, don't expect a lot of discipline elsewhere.
Consider placing a handheld spectrum analyzer on each plane, and the flight attendants can carry it up and down the aisle and sweep for unwanted transmitted signals when doing seat belt checks. Or, for covert monitoring, a Yagi antenna could be mounted to a bulkhead, and connected to a spectrum analyzer in the same cabinet the video player is. Less than $5000 per plane.