Check out an awesome interview done just a week ago with Gerry Lindgren, the best high school runner of all-time:
http://www.americanrunning.org/w/article/yr-interview-with-gerry-lindgren
"The 3-minute mile goal is to teach runners that the impossible is where goals should be set. Setting goals that have already been achieved is a cop-out. We are all Better than that! I would rather my runners are a big flat FAILURE at 3:30 than a whopping success at 4:10."