I doubt they are forgetting. In my torts class this morning, the Prof had a moment of silence, right around 9 am. The feeling in the class of 80 was almost tangible. The silence was not forced, but heartfelt, even mournful. And these are kids, hardly out of highschool when it happened.
The wound is starting to scab over, but it is not faint in our memories. We'd like to move on, but we cannot, for there is no closure, no resolution to this event. For all its sadness and agony, it lacks a certain meaning, because even today, five years later, the enemy--the true enemy--is hard to see, hard to put a label on. We've scrambled left and right to fight back, but, and I think this sentiment reverberates, we've yet to strike at the face of the real villian (and I don't mean Bin Laden, I mean every man and woman who makes the likes of him possible, even popular).
9/11 is not forgotten, not by a long shot. We're just sick of being confused as to exactly what it did and how to move on.