The "honesty box" idea was a one–off response to a particular situation. It was one of those things where we were in the position of everyone asking us what we were going to do. I don't think it would have the same significance now anyway, if we chose to give something away again.
The news may come as a disappointment to many who hoped that Radiohead's example may usher in a new model of music distribution. Other artists like Nine Inch Nails have embraced and extended the idea with higher quality recordings and similar promotions. It remains to be seen if the method will become more popular, or would even prove useful to less well–known acts.