I'd still continue to afk in the flame barracks all day. You can make the overworld absolutely stunning in appearance and it would still be largely useless as a majority of the content in this game is instanced. It would be an incredible waste of funds to spruce up the overworld without also adding longstanding content to it that is not Fate grind related. So I say no to a graphical overhaul of the overworld until they fix the fundamental problem of the overworld being near meaningless in the grand scheme of this game.