I think the TSB is missing the point: if people aren't complying with evacuation instructions being shouted at them during an actual emergency, they aren't going to pay any more attention to an amended pre-flight safety briefing than they do now. It's just going to take a bit more militancy from the folks trapped at the back of the aircraft directed at the oafs up front who are blocking the aisle while they recover their baggage. Should I ever find myself in that predicament, rest assured that any veneer of courtesy is going to go out the window pretty quickly.
