We know it all
You set up a slick wiki and nobody spreads wisdom? You created a super powered blogging platform for your news website and users just don't come? You built a multitude of feedback channels on your intranet, but users just don't want to talk?
All you wanted is change something, start something? So why did you quit halfway?
Change? - It's your business.
Change is nothing than can be achieved by a a president, is nothing that is handled between managers and consultants.
Somebody needs to drive it. That can be only those who are working on it.
Kill your assumptions.
You can't stop. Or it will stop.