Think about it. We exchange dollars, euros, bits, whatever all day long. Do you ever stop to think, "Why does this hold any value to me?" Its because someone else will accept it in exchange for goods or services.
The Onion, as always, captures this perfectly: http://www.theonion.com/articles/us-economy-grinds-to-halt-a...
Now ask yourself: what do central banks hoard? Whatever they hoard must be, at the very least, a more "real" kind of money than the money they print. Do they hoard diamonds? No. Do they hoard platinum? No. Do they hoard fine art? No. Do they hoard expensive wine? No. What do they hoard? Gold. And why do they hoard gold while publicly stating it's a useless and worthless metal? "Tradition", according to Ben Bernanke.
So if you believe our rulers, you can sleep sound in knowing nothing is real money, and the worthless stuff central banks hoard, they're doing it just because it's tradition. All this work of moving this stuff around the globe in armored planes and escorted ships, it's all for tradition, you see.
In a nod to Accelerando (http://en.wikipedia.org/wiki/Accelerando), the only value store I could see being useful in the future is perhaps reputation.