My guess is that we finally get to kill her in 9.0, after she either kills Bolvar or brings him into submission. My thoughts: We fight bolvar or he becomes our ally and is somehow controlled by Sylvanas, we break him free and fight her with his help.
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A lot better than most twitch or wowstreamers that do nothing but hate on the game. The game needs more positive wowtubers/streamers. NK is pretty positive about her stuff too.