The day they update the vault space, I'll have a full vault. Currently I've had to resort to having many weapons permanently stored on my three characters because there was no room in the vault. Now I'll finally be able to free up some space on my characters, but the vault will be instantly full. I have all exotics, all but one raid weapon, and about half of the Iron Banner weapons. I hope this is a short term solution as you mentioned because after they add new exotics and a new raid full of weapons there just won't be enough room. I even resorted to keeping 3 of every weapon I use weekly to prevent having to put them in the vault to switch characters (Because my vault was full months ago).