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.
Leading is a concept from the primitive past
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.
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?