Maybe we have something to learn from the Skydiving fraternity here.
They realized some time ago that the main danger of a camera is not entanglements, malfunctions or just its physical presence.
It's that they increase workload and tend to cause changes in behaviour.
"is it loaded ?", "did I switch it on ?", "getting the shot", "performing" etc etc.
For this reason cameras are prohibited until (I think) 200 jumps on the basis that users are more experienced and better able to deal with the additional workload.
Personally, I'm a big fan of the cameras when flying - they are great for post flight analysis and training and you can re-live the enjoyment of being airborne whenever you want.
Rather than just banning them It would be nice to see some of the issues addressed in pilot training - as is often the case, its the "meatware" that's probably more dangerous than the "hardware".