One means of defining ourselves is by our job and the means of defining our job is what we do, what are our tasks? Sometimes that is hard to define. Certain tasks can be essential when working in a multi-discipline organization, however explaining how they relate to the overall enterprise can be a challenge. Especially, if they focus on organizational cohesion to move projects forward rather than direct application of a certain discipline.
As Seth asks, if your tasks, that which you do day in and out, ends does that end your job. If that job and those tasks have defined you, how do you then define yourself? As Seth points out, organizations often do a bad job at responding to this, depending on all too often on worn out paradigms. I am less optimistic about his ideas about creating change within the organization. Most upper management would not go for it and neither would most of the line staff. I believe it is something one will have to do for oneself.