I don't think so. As much as I love my Vex Mythoclast, this would be a mistake to have Vault Weapons at 331. There is a reason this has never happened in most MMOs. It would be a bad business venture, as well. The grind is one of the driving factors of MMOs, albeit luck has a bit to do with it. Though Destiny is kind of a handicapped MMO. I do like the idea of creating a system to upgrade that requires you to venture into the new raid, and complete certain challenges. This won't happen, developers want you to use the new stuff they spent hours in creating and coding. I feel a lot of people playing Destiny do not quite grasp the concept of MMO xpac/DLC (whatever you wanna call it and pretty the genre in general). They want you to play the new raid for the new weapons and armor. TLDR: MMOs ar grindy and want you to use new "shinies", not that ragged VoC you got yesteryear. Shard your old shit or keep it for nostalgia. This isn't COD, there is no, "Old Trusty"