Bungie didn't say that last-gen consoles can't handle more vault space. What they said is that last gen consoles can't display more than the current number of items on the screen at the same time. So another solution that doesn't involve severing the ties between the four systems would be this: change the interface for the vault so that you don't display everything on the screen at once in a giant, hard-to-use grid.
A redesigned interface for the vault could make it easier to use and also allow all systems to enjoy the benefit of a much larger vault. Or even multiple vaults!
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I agree! a 2nd page/tab would seem to solve the problem... great call man