People who can use a bike to commute should be safe doing so, but most people can’t replace cars with bikes, and people who need to shop and bring things home can’t do it on a bike. People coming downtown from Sandy or Provo certainly can’t ride all that way.
I see that Dave Iltis, a capo in the bike mafia, thinks it’s unreasonable to expect riders to use side streets. Why, exactly, is it unreasonable? I think it’s a great solution to improve overall traffic flow by keeping bikes out of traffic lanes, and keeping sidewalks safe for pedestrians.