The problem is that the changes you're asking for wouldn't be simple changes from a development standpoint. Things like changing dialogue are easy to do and don't require any major changes to how zones are set up. Those kind of changes can't happen easily since it messes with how people new to the game see those zones. The reaction we see to people's deaths in StB don't change how the zones are set-up either. They're all story content with changed dialouge afterwards. Which is pretty much how Nanamo's death was handled too.
That said, I get the feeling we will be seeing more of Ishgard coming to terms with the Dragonsong War in 5.0. They said crafting is getting new end-game content which is the reconstruction of Ishgard and that it will have a story to it. So I wouldn't write of getting to see the aftermath of HW just yet.