Honestly if they go the way of making Tyrande "shed her desire for vengeance because she's gone insane" or make the players kill her because "she's been driven mad", then I think I might just be done with WoW.
Her being nowhere during 8.2 is one thing, which is why I skipped that patch, but ultimately I can at least argue that there is a reason to have her not focus on Azshara and Sylvanas simultaneously, but this would be a whole cause of utter bs.