I get where you're coming from, and I agree that there's a subtle distinction, but realistically, removing the alias can only lead to a situation where taggers use the two tags interchangeably regardless of their definition. Neither the term "self shot" nor "selfie" expresses in any way that "this tag is solely for depictions of the selfie that was taken" so I don't see how you plan on convincing anyone to use the tags differently, especially considering this alias is nearly five years old. You know as well as I do that very few users ever actually consult the wiki for tag usage, let alone the forum.