Some of you may remember Chris Locke's great blog of that name from back in the early days of blogging. You could feel the force of his writing pushing against the tendency for things to revert to previous states or to fall apart.
Entropy, in its sense of a return to equilibrium, is a powerful force in organisations. Whenever you make a change, unless you continue to inject energy into the system, things are likely to return to "normal" pretty soon. So many of my clients put in social platforms at work, have a communications push to start if off, see an influx of users, then it all slows down, often to a halt. The novelty wears off. People return to their old ways of doing things, and the naysayers get to say "I told you it would never work".
You have to keep injecting energy, you have to keep caring, you have to pick yourself up and try again, and again. The sort of change in how we work that we are on the brink of is worth the effort but unless we keep injecting energy we will stay teetering on that brink.