Many questions w/o answers in this speculative column. If the race to hoard commodities over to the China side is any indication, the above quote from near the end of the article could loom significant.
If the long reign of the USD is now in jeopardy it would be because the $30T national debt is never going to be paid, in which case confidence in the USD as the world's go-to currency could evaporate overnight in a great cascade. The chicoms have long endeavored to undermine it in favor of their own yuan.
Dollar hegemony won't end because it cannot: no other currency bloc will allow the enormous trade deficits need to become a reserve currency, and the political risk with China vis a vis the yuan is so insanely high that no one would accept it as a long term reserve.
Germany's and China's exports would also tank-- right now the ECB is worried about a collapse in German exports driven by a rise in the Euro vs. the dollar.