Odds are there isn't going to be any more vault space. The game still has to run on last-gen hardware, and the game is getting to a point where its struggling to do that. I think Bungie is adding crafting to the game as a way to remove the need to hoard weapons in our vaults (build it when you need it instead of holding onto a weapon that is three years old.) Also there are good videos out there by Datto (PVE) and Fallout Plays (PvP) on YouTube that can help you to prune your vault where weapons are concerned. Like you, my vault is filled up with a lot of exotic armor. Although Bungie removed the element lock on most of the weapon mods, all the "combat style" and seasonal mods are still element locked. Best advice I can give you is to go through your vault and be ruthless about what exotics you actually use. If you're honest, there are some exotics that you simply aren't going to use. They're terrible for whatever part of the game you play, and Bungie is showing no interest in fixing them (All the melee based Warlock mods for PVE). So those armor pieces are just taking up space that you could use for different elemental versions or stat distributions on armor that you'll actually use. Also, odds are you don't play all three characters equally. So favor your main, and limit yourself to jsut the stuff you use frequently on your alts. Oh, and the Ascendant Materials? Use them. Masterwork gear, that way when you dismantle it, you'll get some of it back. Which is better than losing stuff because you left in your your postmaster.