Leave it up to Gary Hamel to come up with some thought provoking ideas. In this article in the HBR he proposes that managers are useless and comes with a nice statistic:
“A small organization may have one manager and 10 employees; one with 100,000 employees and the same 1:10 span of control will have 11,111 managers. That’s because an additional 1,111 managers will be needed to manage the managers.”
He goes on to discuss how great it would be to achieve coordination without this huge supervisory structure over it. It is a great read and you can find it here. Needless to say we tend to have a slightly different view, providing managers follow our 10 points of management.