I think it is probably that it is easier to celebrate the secular Christmas. I mean, I know a lot of people who are various religions, or atheists who celebrate a secular Christmas because it's an American tradition.
I also wonder if they are worried about not getting TOO into the religion and having it seem , I don't know, like they are treating it as trivial if they try to keep it light? I mean with Christmas you have Santa, Rudolph, elves, pine trees, snowmen etc. etc. which have nothing to do with the actual religion of Christianity. From what I have seen, the only deeply religious Christmas thing around
MVMCP is the Candlelight Processional at Epcot, where things are a little more serious anyway.
I don't know if these are any secular symbols of Hannukkah (sorry, I'm just not that familiar with Hannukkah, aside from some of the songs) but I would think having Menorahs, driedels, etc. would be a wonderful addition to the celebration. I LOVE Hannukkah songs. When I was in school in the 80's we sang Hannukkah songs in Dec. and they were so nice.
I'd also like to see them celebrate other winter time holidays as well, including Winter itself.
But I am one who likes learning about different cultures. So I personally would like to see more done with other holidays for other religions. They could easily do something more.
Maybe we should all write letters? I know it sounds crazy, but maybe no one has ever really asked them about it?