It will be interesting to see what other people think about my gold/silver/bitcoin allocation tables.
I've always thought the FOA idea of revaluing gold at $55,000 was kind of absurd since India and the Arabs have so much of it. The west would just be transferring power to 3rd world nations.
If official figures are to be believed, then the US is actually in good shape with regards to your scenario.
I've been collating figures over the last several years:
All monetary gold: 33000 tonnes
Us has actually 8133 tonnes
ECB 10788
Russia 1500*
China admits to 1823 tonnes (probably around 4000 total)
UK 310 tons left
IMF 2800 tonnes
Figures are pretty sloppy, but from rough order of magnitude, the current monetary powers seem to roughly match gold holdings.
Of course, nobody has seen inside Fort Knox for decades...