Our cranky old commenter Cranky Old Mission Guy might be on to something:
I have an idea.
How about all us pedestrians pick one day per month to meet, link arms, and walk from one place to another — completely blocking the streets AND the sidewalks — while randomly ignoring traffic laws, common sense, and any notion of courtesy to other San Francisco residents (we’ll blame it on “the fringe element”)? I’m sure the bicycle people will be happy to show their solidarity by not trying to cross our lines!
Sure, he’s being facetious, but really — why not have a pedestrian Critical Mass once a month?