For those of a Jungian persuasion, I couldn't help think of the idea of an organisational shadow (see Jungian Shadow), partly prompted by some of the recent things I have been writing on here but also from a post by Jennifer Rice and a link to another post on the Fouroboros blog.
You can't change organizations. You can only reveal them to themselves. And they like what they see. Or not.
If they follow the "or not" path, you can offer suggestions as to the alternatives that fit for them, and for what they believe. If they haven't evolved to the point of knowing what they believe, you start there and the rest reveals itself.
It is really that simple. The rest consists of removing spackle and years of self-deception.
If you're interested in these ideas and fancy a deeper read, have a look at "Dilemmas of Organizational Change: A Systems Psychodynamic Perspective" by James Krantz