Should just leave Morrowind out of it, it's there to play if you want to. Skyrim should hopefully have it's own collection of peaceful songs and powerful action songs like Oblivion had.
I don't think it would fit very well. Especially for a march to the final battle. I'd rather hear Skyrim music, but something unique for special moments like that would be nice.
Or perhaps it would be more epic if the 'Skyrim' theme started playing? Since its not morrowind. I like morrowind but I think it sounds slightly like though its a good soundtrack that your living in the past and expecting a new game to be completely like Morrowind.
Id like to hear it because of how much of a soft and graceful tune it is, and how fitting it would be for something akin to a battle march. calm before the storm sort of thing.
its not cos im a morrowind fan boy. (daggerfall is teh ultimatz)