I can see Bruce's parents from beyond saying,"Good GOD, Bruce. Live your life. We never wanted this." It also makes Gaiman's idea of what if Batman was just something Alfred constructed to keep Bruce from killing himself or something seem more real.
And also why I like Dick being Batman, at least for a while. Because there's more to Batman than psychosis and obsession. And that aspect...has been explored, and I don't think there's much more to say about it in comics. At least for a while.(it doesn't even work that well in the movies. In the first one, during his training Bruce learns there's more to it than that and is not much more than a rage addict before Ra's finds him, and in the second...well, Batman's kind of a supporting character in that anyway, isn't he?)