Quite simply we need to keep 121.50 for pure "mayday" use - PERIOD. A second frequency for "pan calls" and slightlty less urgent assistance is therfore required!
I reckon that a great deal of "practice pan" calls are made from lost or dissorientated GA pilots on 121.50. These calls still require assistance (before they turn into a full emergency) but could be made on a sister frequency, thus leaving 121.50 open.
Of course this won't stop those who abuse the frequency untill they themselves have a mayday situation. Im sure the last thing you want to hear when you are on fire at 30w is some guy playing the harmonica or telling jokes about his mother in law!! How about a completely different frequency say 199.99 for chat over the pond? just a thought!
Retreats and waits for the slander!!!!