"Time is an illusion, and so is death." in other words...you are never truely seperate from someone when you're apart from them(people in the??past and in the??future)...Toph dying has NOTHING to do with time being an illusion...that's just the odd connection that seems right...Toph is too intergal to the story to kill her...but that's just how I see it
that and Earth Kingdom is Forever