Ho~, I wonder if Tsukune would have an immunity to Alucard in his dark form. Even more interesting if Tsukune could "absorb" a bit of Alucard, not a lot, but just enough to give himself a little more of an edge.
Of course, it would turn pretty bad if Tsukune turned into a monstrosity himself just for the sole purpose of trying to eat Alucard. Hmm, human/shinso vampire hybrid bites shinso vampire monster... an unlikely role reversal.
But, I SO hope Akasha can reemerge from her own slumber to either rejoin the land of the living, or.... something else I can't think of at the moment. At least she should say hello to Tsukune either way.