I've seen a post where someone suggested a library so we could view the grimore cards in game, which would be a great addition. Im not sure if anyone has suggested this but I would love for them to add a museum or something similar which they could put next to the library. It would obviously allow you to walk around and look at various artefacts from the destiny lore and from story missions. It would also have guardian armour on display and allow us to donate our duplicates to the collection. Once you finish a collection (axiom coven 1-6, scout mail, etc.) you would get a credit (like vanguard marks, and crucible marks) which would be usable to buy a legendary armour set. It would add another use for all of the low level loot, add a collection system to the game, and another set of missions/bounties to collect various artefacts for display. Also it could encourage people to try all 3 classes to complete the collections and/or trade with others. The main reason I want a collection system in the game is because I love things like that, and I really like both the axiom coven and AOS#AL-Suhail armour sets and Im running out of room in the vault. Plus i'll take any extra content I can get.