This is one question that came across every spiritual leader, be it Swami Vivekananda, Chinmayananda, Satya Sai Baba or Sri Sri Ravishankar. This is like asking if a train can run without a guard, a ship can sail without a captain, or a class can go without a teacher.
The direct answer is YES. Because, the spiritual leaders are required to remind us various things that we other wise forget to acknowledge in our ordinary lives. Spirituality is a way of living and the very essence is to know how to control one's emotions and manage lives without negative perceptions. Spiritual leaders are those people who define the righteousness, set a way of practice, proclaim the methods to manage our thoughts and provoke us with the effective speeches that transform our thinking. All this people would have undergone a kind of enlightenment, empowered by a practicing what they preach and determining their own way of understanding God and oneself. To me, its a kind of dawn over my zooming thoughts, a kind of realisation of what I am, and a kind of understanding the reality behind my various thought processes. The vivid knowledge areas, and various processes that control and define our lives, and the kind of people we interact, and the kind quest that makes us search for an eternal blessing and transformation from this materialistic world. Almost all of the spiritual leaders at one point had been doubted as con man. What an ordinary person fails to understand is that these spiritual leaders are far above all these materialistic things that happen to them in life, after they become what they are to the world around. Its like a fully fed man, being given more and more of food. It doesn't make any more sense of the extra food that the person gets. Similarly spiritual leaders are the people who have attained a saturation and anything beyond is just meaningless and questioning their worth or wisdom is equally a useless endeavour.