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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1 Replyi think just doubling the size from the like 25 slots each item class to like 50 like make it pages so when you press page two it switches from the first pannles to the second one not one huge pannle of items just two segments