If this game was more character-centric then whatever, I’m not against the concept.
But it’s not. WoW’s characters are largely wallpaper or show up solely to move the overarching plot of the day forward.
You don’t get any real character development in the game anywhere, the only stuff close comes from the novels.
So no, I don’t think this is the correct game to implement this kind of feature and I hope Blizzard doesn’t try it.