It's high time people realize something about these positions. Being at the top of a gigantic mature hierarchy in a complex world is more a function of legacy than utility. John D Rockefeller or Thomas Edison were the single BRAIN that shaped and directed where their orgs went. Today's leaders in govt or in the private sector or more like a single neuron most of whose time is engaged in constant power struggles for survival. Nobody with any real sense wants to be sitting in these chairs other than the mindlessly ambitious. CEO's are propped up. Cause we are still hardwired to believe in kings, popes and heroes taming complexity we can not handle.
With data flowing in like never before on the utility of these roles it will get increasingly and unavoidably clear in the next few years on the over importance we attach to "leadership". We are not on the Serengeti plains anymore.