The risk to the dollar is a flight to gold causing an decrease in interest of buyers purchasing treasuries, resulting in higher rates paid to buyers of this debt. To give a sense of scale the US issues something like 1-2 Trillion in new treasuries a year, which is roughly the value of all 8,133.46 tons if sold at current market price.

For example a 2% increase in rate on 1T in 30Y treasury issuance over 30 years is $600B.