SF may be doomed just because the message that sent may be wrong, making users less inclined to provide help/answers to others.
While you can all see that I do have quite a good experience on SO site, I could say the opposite abouyt SF.
Why?...because many people with moderation permission around here are some kind of bullies that are inclined to find reasons for considering new questions off-topic instead of using their brains for trying to provide help/userfull feedback.
It is much easier to Flag than to provide a solution... that take time and efforth.
I hope I'm wrong and it was just bad luck, still my impression is that most SF veterans are bulling lower score users, something that you will not find on stackoverflow.