Leading is a concept from the primitive past. Being lead by someone should be something to be examined pathologically. Even if there is a way to lead and not kill the golden goose, you are still doing something wrong. For example. you can't possibly represent a group of people and be honest with all of them. If you have ever been a leader you will know what I mean by this.
There are no personality types. That's just psych-crap. All humans are dynamic characters. The problems is to be born in a society with leaders and consider leadership as something "natural". Well it was much like believing in Gods and fairies but it is not anymore.
It is a relic of the past that is still propegated in a positive way.
Yeah It's definitely impossible to fully represent everyone in a group that becomes to big. Also because of the propaganda that the group creates about there leader, it usually changes the leader to be more self centered ironically.
Well Since these ideas of leaders and gods have existed as far back in time as we know of, it is very hard to prove or disprove that it is ineffective anymore. The powers at be do not really even give a chance for that type of experiment on a global scale. I do see you point though. You said that it's a concept from the primitive past, when do you think it changed as ineffective?