I read the transcript of a speech by Richard Hamming included as a part of this SO question and the speech had a quote that got me thinking about when someone should move into development.

When your vision of what you want to do is what you can do single-handedly, then you should pursue it. The day your vision, what you think needs to be done, is bigger than what you can do single-handedly, then you have to move toward management. And the bigger the vision is, the farther in management you have to go.

Any other suggestions as to how you can decide if you want to move away from the coal face and into management?