I don't buy it. Data collection is much easier today than even 10 years ago, and I don't see any evidence that "more people will live a reflective life and make better choices."
We are not there yet; most people can't go to their computer and see exactly what they've done in the past week, month, year -- how it compares to others; and does it match goals that they've set etc. The trick is that it has to be automatic.
I'm pretty convinced the Prius dashboard changes the way people drive already.
Watch a Prius driver, they just drive differently from the rest.