Looks like the "bicyclists" [1] are advocating training for those pesky pedestrians who are erratic, unpredictable and simply don't know the rules of the path. This "walkability" training would meant that they won't pose a danger to themselves and other, faster, path users.
Three parts, beginning with the rules. But worth following to part 3 for the full argument.
Robert
[1] I object, I'm pretty certain I'm a "heterocyclist" if anything, simply due to the variety of different bikes I ride!