Oxford wrote:despite the ninjas best attempts at going unnoticed, they have no legal requirement to be seen with lights and reflectors. You should only ride as fast as you can see.
While you've made many good points, this one isn't one of them. A shared pathway or bicycle path are both like roads from the Road Rules point of view. A cyclist has an obligation to have lights that are visible at 200 m - not just reflectors (see Rule 259).
It is primariily the ninja's fault if they have a collision. Not saying that you might also lose something for some contributory negligence if you admit not slowing down or were otherwise riding recklessly. However, if you ever unexpectedly cross paths with a ninja do everything you can to render first aid etc.,. but make sure you hold them to their legal responsibilities.
As to the central topic, I agree with your point that walking on the right will not be safer - it puts you at greater risk of injury by raising both the probability of a collision and the extent of injuries. It creates confusion because it is contrary to the keep to the left rule that applies everywhere else in relation to the road rules and commonly observed footpath rules.
Any reason you could contrive for saying that walking on the right would be safer could be equally applied to the cyclist. So if you tried to implement this practice, cyclists would simply react by riding on the right also (I would if I knew all peds were doing that). End of any illusion of benefit to the pedestrians. But there would still be increased risk due to the confusion between the rules applying on the shared path, and on every other footpath or road.