Again and again this claim... I fail to imagine how anyonr believes that the US or China could be stopped from going to war by not having enough BTC of all things... In a BTC world they would simply borrow BTC (if they wluldnt control 50% of hashpower anyway) and that would be it.
If you imagine that people wouldn't lend BTC to the US, remember that, when Standard&Poor's reduced America's credit rating, US bonds shot up in price (even though technically they were the one asset that S&P's rating was about the most).