It is a childish argument. A walkable/bikeable city is a chicken and egg scenario and the author has it all ass-backwards. Infrastructure to encourage walk/bike/bus comes first. People will not walk/bike if there is no safe way to do so, or places near by to go to. I love walking and biking but it will not get groceries to the store or lumber to/fro the Home Depot. It has its place, but it is not a panacea.