One problem I see in this argument is that bungie will already be making this game harder whether or not xur sells gjallarhorn. They've done it already with raising the level on the nightfall, heroic and daily and I don't see them ceasing that trend for the foreseeable future. As for the issue of gjallarhorn no longer being special, it can only get better if more people have it. It's one of those few exotics where everyone can benefit from having it.