Can you go later in December ???  That's what we are doing !  December 12-16th.  We went same time last year...originally we thought it was too late in the month to get ready for the holidays etc....but we actually liked it!
I know there is availability cause I just upgraded today from a studio to a 1-bedroom and there was a lot of availability all in all the resorts!
Good luck!
Cant beat the $49.00 airfare!