I think down the line it could be possible to upgrade year one weapons. Towards the end there will be almost no reason for them not to bring back old weapons. But during the next few years of playtime I like the idea of always trying to find something new, it will keep me playing - and my fireteam will keep giving me crap every time I don't get it too. But I love that and it will all be possible each time they cycle weapons and armor.