Look at all of them old weapons being un-sunsetted... Hm... But seriously, if all the old gear becomes relevant in all content again, they should add a lot of it into Xur's inventory for possible sells. I also want a legendary weapon engram that you can buy from him that drops a random legendary weapon from all of the old ones, kind of like the exotic engram, but it just drops any legendary gear from old in general without any additional conditions. If they want to put a purchase limit on something like that, fine, but they should really use what's already in the game. Those old weapons aren't going to patch themselves out and Bungie certainly isn't going to update every single one of them. I bet you're not going to see Gahlran's Right Hand get updated unless they bring back the Crown of Sorrow raid, and that's currently unlikely.