Curve your Enthusiasm
What can you do to help people persist with a change? This graph from Ray Immelman is brilliant. The fact it's over-simplified doesn't matter because there's enough intuitive truth in it to be convincing.
Before you introduce a change, show this graph to everyone involved. And when the initial enthusiasm drops, and people start to have second thoughts, pull out the graph again.
|"OK, let's give it a whirl!"|
|"It's harder than it looks."|
|"It seems to be working!"|
|"We're reaching the point of no return. Do we really want to do this forever?"|
|"Hey, we're starting to get really good at this."|