The best way I have found to get decision makers to go with the more sustainable choice is to show them that choice in action, and let them talk with the person(s) in charge at that place.
Tonight I ran across a video of someone doing just that. The subject is not permaculture (it is focused on getting more city dwellers to travel via bicycle). But I really like the process they are using.
I think such an approach could work with permaculture, and many of the other subjects in the permies.com forums.