Hmm.. To me, bluntly, (sorry) it basically just means a 6-page out-of-date document - a pact that was never legally binding (and did not prevent oil trade and arms exports with other countries) - has simply expired. The US can still sell arms to Saudi. The Saudis can still sell oil to the US. Both can still sell their wares to other countries, only now a dollar conversion is not needed for the Saudis. Whether this significantly impacts the dollar's global popularity, I don’t think so as that is largely based on the US’s status as the world's largest economy.