I would assume they would add additional pages to the vault, as it works with your friends list and currently players list.
Another possibility is that they could split the vault into three different vaults. One for inventory items, one for weapons, and one for armor.
EDIT:
Many thanks for all the replies and opinions!
Can we make it to the trending page??
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Should have categories- uncommon rare legendary exotic and if you have doubles let them be able to stack. I like to collect but unfortunately I had to delete several legendary and exotics yesterday to do the raids. Glad I did tho.. lol