For what it's worth, I've been checking some room avails for Dec 26-Jan 1, typically the busiest week of the year, and the All-Stars at least are already gone.
I've been the past two years one week earlier, before Dec 24, and the crowds were moderate to heavy. (45 min waits on all the goodies).
My guess would be everything will be about 5-10 % down from usual, given both the attacks and the sluggish economy. I know my OWN economy is running on the slugglish side, which is why I'll be home for Christmas!
Also, a recent AAA survey predicts holiday travel down 6%.