Relax, they're not going to do anything to Turalyon.
If Blizzard wants to continue with this foolish nonsense that the Light is Evil, they will simply use the new Emperor of Arathor. A fresh canva, an unknown, that can be developed however way they see fit, instead of assassinating Turalyon or Yrel.
Rejoice, Turalyon is not going anywhere. Especially since Stormwind has experienced an unprecedented period of stability and peace since he took over.
Ah Yes, I am so happy, words cannot possibly express how happy I am that nothing will happen to Turalyon and there will NEVER be a Siege of Stormwind.

(Instead, we'll have a Siege of Avaloren with Emperor as the final boss)