Interesting that they're permitted on some aircraft types, but not others. That suggests that some actual genuine thinking has been done on the matter, which is reassuring!
As an aside, the new wireless ear buds from Apple aren't Bluetooth, they've spun their own chip (and, presumably, their own radio standard) for the purpose. I can't see that as transmitting more power than Bluetooth, most likely less so it's probably even less likely to cause problems than Bluetooth. But because it's an unknown, presumably it'll have to be treated warily until further notice...
But who'd want wireless ear buds on a plane? Drop one and lose it and it's a miserable rest of the flight. Not due to the flight as such, more down to the thought of having to shell out another £150. for replacements..