Actually, they did say that the additional vault space they added was a temporary until they worked out how to efficiently add even more. I think there will be more in the future, the problem is 360 and ps3.
you only use 3 weapons at a time.
you get killed by thorn 1 billion times per game in crucible.
you use auto rifles seriously once in a while (never)
what is more important now ?
Yes, you get killed by thorn. You also get killed by TLW and Hawkmoon, vex, Red Death, MIDA, Suros, and an assortment of legendaries. Let's turn all of them into water guns!
To each his own. I'd rather be able to take the stuff from the postmaster that I don't have any space for than see them attempt to rebalance weapons and wind up making, say, auto rifles "god tier" like they used to be. Then everyone would whine about Suros being OP.