In response to the Phone or Oxygen mask...you know some chav with a tiny IQ will grab their phone, pass out, then turn around and say they were on an O2 contract and try suing them.
Seriously though, this will inevitably cause arguments in the cabin and make cabin crews jobs harder. How do you make someone turn off their phone for TO/LDG and then allow them to turn on their phone in flight? Hopefully there will be something in the cockpit that will allow us (the crew) to turn on/off the base station. At least we would then control the connection.