Leadership can come from anyone, at any level of an organization. In fact, those at the top are sometimes not close enough to the ground to see what's coming. For example, look at what happened at Microsoft. Bill Gates did not understand the Internet and the impact it would have on his company. It took an employee to make him see the light, but when he did, he turned the company around on a dime.
Librarians are better consensus builders than leaders.
That makes us inclusive, cooperative, and willing to build on the work of others. However, we don't always rise to the occasion on an individual basis. In an attempt to include everyone in decision-making, we end up watering down the decision. Radical change cannot be achieved by consensus management, except perhaps in times of clear and present danger. Sometimes you need good, old-fashioned autocratic leadership.