There is still story to tell, but there isnt much.
If he doesnt get min-controlled/become a fanatic then he is pretty much just one in a long list of characters who would be in line for pretty much exactly the same plotline, important characters including Anduin, Arator, Calia, Velen, Yrel, all the lightforged and generally all the light aligned characters in the story.
If he is mind-controlled then that would be a regressive move, and more importantly be too perfect an end for the character to pass up.
There are still nuggets of story to be mined if you really want, and obviously it is always possible to add more story if you want to, but at some point you have to ask why the character is still around if it comes at teh expense of other equally if not more interesting storylines.
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Because leaving him alive doesnt serve any narrative purpose, whereas killing him does.

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