But of course there must be a vision before you can stay on story. While leadership must be shared, it is not democratic. You cannot have leadership by committee or consensus. The leader at the top is the keeper and enforcer of the story for those who report directly to him or her. Those folks are the keepers and enforcers of the story for those who work for them, and so forth down through the organization.
Leadership is everywhere in the organization, but vision flows from the top.
Visions are normally tested by economic and technical realities. The Sea ride, as realistic as one would like to make it, can't really dive 20,000 leagues under the sea or even under an artificial lake. Visions are also tested and further developed by the team of leaders who are enlisted to make the vision a reality. Not everyone will share even the best leader's vision. Sure, after a while employees hardly read it.