If everyone is a leader, who will be a follower?

Even if we imagine a world full of leaders only, it will still be a matter of perspective what means leading. There is no way a single person to know everything which is a well-known truth ever since ancient times and Aristotle's famous quote just confirms it: 'The more you know, the more you know you don't know'. From this perspective it is clear that a knowledgable and innovative leader in one sphere will be qurious follower in another. What is more, most often these roles are not strictly defined which makes it easy to be a leader and a follower in the same time.