As you have no doubt found; ask for an opinion and you will get it. Some people on this forum will call a spade a bulldozer and then use it to help you dig your own grave and don't mind getting down and dirty to do it. Dont stress: thats my job
Liken your scenario to 3 cars on the road: first car is a stereotypical 87 year old duck driving to church at 25kmph (pedestrian in your case). Second car is a middle aged couple going for a sunday drive - cautious but not a hoon (1st bike in this instance). You are a 3rd car driving patiently at the rear (2nd bike in this instance) waiting for the safe place to pass 2nd then 1st car. However in the midst, 4th, 5th & 6th cars (or bikes) are impatient 20-sonething stereotypical impatient hoons. Cars 4-6 proceed to overtake cars 3-1 with scant regard as they want to beat the drive through queues at boganville maccas.
Whilst 4-6 cars are overtaking, old duck sees a cat on the road so slams on the brakes, which inturn causes 2nd car to slam on brakes as the couple had nowhere to swere given the hoons are alongside, which then causes you to slam on your brakes. However you have the misfortune to smash into 2nd car (or 1st bike in your instance).
According to the all powerful rules of the police (and insurance) you would be busted for driving too close, more commonly known as tailgating. Regardless of what the 1st or 2nd vehicles were doing
In summary: yes some people would argue 87 year old drivers maybe shouldn't be on the road but what can we do? Yes hoon drivers shouldn't be on the roads, but what can we do if police aren't around?
Maybe apply the 2 second distance rule learner drivers are taught to your shared path cycling?
As for putting pedestrians on separate paths: I draw your attention to Beaconsfield parade between port melbourne and stkilda where there is infact separate paths for pedestrians/ joggers and cyclists/ roller bladers. Anyone who has ridden it will recount tales of pedestrians walking on the wrong path despite the signage plastered on poles and the ground. Unfortunately your plan appears doomed to fail if Beaconsfield parade is a test case. People will always walk, drive, cycle or rollerblade (or segway) wherever they damn well please, and then some regardless of what infrastructure is put inplace.
- at some people who insist the footpath is designed for small cars to drive on
Hope this helps draw a clearer piccy - i tend to be visual and bring things to a level I can relate - or a 4 year old. The ole "KISS" principle
Edit: as for banning pedestrians during peaktimes like cyclists are banned from parks: 1 how will pedestrians still get to their destination in the shortest time given walking is the 2nd slowest commuting method (behind catching a train
) and 2. How will it be policed given the police are very very very rarely on southbank patrolling the supposed 10-15kmph speed limit where pedestrian traffic is substantially higher during peak times?