I agree with Robin Hanson. I'd go further and say this smells like unsubstantiated self-help in disguise.
It's interesting that Hanson's wife, who also works with dying people, cannot recall a single patient spontaneously expressing a general life regret. This suggests that Bronnie Ware asked the patients what their greatest regrets were.
For one thing, this strikes me as a bit mean. Of all the things that you could ask a dying person in their last days or weeks of life, why ask them what their regrets were? If you care about their welfare, there are better ...
http://www.guardian.co.uk/lifeandstyle/2012/feb/01/top-five-regrets-of-the-dying?fb_action_ids=10151236956340524&fb_action_types=news.reads&fb_source=other_multiline
Interesting b/c future concerns and what other people think type of concerns are not much of a factor here.