Seems obvious...
If people are concerned about the amount of chatter on 'point-five' then surely we should all look at ways in which we can reduce the negligent / inadvertant use before we start on legitimate usage.
All through our training we're all taught to be accuarte in everything that we do - so why should that stop at the radio?
Personally, not in favour of 'training freq' - conditioning may we'll send somebody there when they really wanted 'point-five'. Sorry, can't take that chance.