I don't think that anyone would sit in their seats and die like that again. Everyone knows what the outcome is if there is no response. I think that people would rather go down like those on Flight 11 did in Shanksville.
If something like 9/11 were to happen again on the flight that I was on, I would prefer to die in a battle with the hijackers, not in my seat. Even if one had a gun, I think I could take 2 bullets, maybe 3. All I need is 5-6 others willing to do the same, and when that hammer falls on an empty chamber, the rest of the passengers would have an open opportunity to retake the aircraft.
This is exactly why I believe passengers should be armed, if they are licensed to carry.
Give us a chance!