Let us not forget we're dealing with Blizzard, corruption would be its middle name if companies can have middle names. Jaina was pretty much personified peace, willing to sacrifice her own father to stop an all out war between humans and the newborn Horde. After MoP though? Easily the most aggressive, hateful Alliance leader up until mid BfA where she softens up a bit and Tyrande takes on the mantle.
It wouldn't be beyond Blizzard to come up with some sort of event that turns Turalyon into a fanatic zealot that wants to purge all 'dark' powers and entities from Azeroth - after all we have warlocks, demon hunters, death knights and void people walking around. Alleria might even give out quests saying her husband needs to be stopped, who knows? Or perhaps Khadgar would intervene like Kalec did when Jaina was trying to pull off a Stratholme in Orgrimmar.