oh, well, I think you and I agree ... The death idea is inspiring, but is an overkill. 99% death are natural death. For people who worry about it, they should add their logins to their will. But then, dead people are supposed to be gone, with most of their stuff.
You can encrypt your passwords or just say "I've left my passwords in a locked box, the combination is X".
DISCLOSURE: That app is mine.