Hmm, I don't really hate Elaine, but I think the whole master plan thing doesn't really fit into the concept of the first 4 episodes. The only two persons who seem to have a plan, were LeChuck and the Voodoo Lady, and from the reactions of the voodoo lady I tend to believe, that she doesn't know what will happen as well.
I think the whole Demon Bride thing made more sense, if she was forced to be LeChucks demon bride. Giving in to be a demon, hopping that Guybrush will save her is not very clever, but I think that Telltale has more adventures of Monkey Island to tell and that we have not seen all possible endings
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I also find the possible Jean Grey/Dark Phoenix storyline quite interesting, though it reminds me of Freedom Force 2, but hell, it was a good game too, and you can not reinvent the wheel all the time.