The more I think about it, the more I believe my primary issue with the current system at IAD is more the fact that you cannot predict given the same circumstances (same day of the week, same time of day, no special case like holiday) how long its going to take.
And I must add the variance is quite large and makes absolutely no sense: case in point yesterday (wed before thanksgiving) by any means the worst day for travel I barely waited 5 minutes in line at IAD security @ 3PM ... A couple weeks prior to that (midweek, mid-afternoon) I spent 45min to go through ...

So ... here is my question : do the airlines communicate PAX counts expected per flights throughout the day ?(corrected to remove the connecting PAXs that do not go through security)
(if they do, then, I guess it's time for TSA to uses the data to staff it's stations !)