Good call.
A. The "petroyuan" is already doomed because of both market forces (oil glut) and lack of support beyond BRIC countries (and only lukewarm, at that).
B. The USD isn't strong merely because of the petrodollar. There's the little matter of those eight-plus aircraft carrier groups we have roaming the world, not to mention the USAF and all those ICBMs.
It gives us a lovely sense of security.
So . . . what happens when the "petroyuan" has to contend with a crisis, like a cross-straight war with Taiwan? Or a hot war in Korea? What does that do to the Chinese bond market, which is inextricably tied to the "petroyuan"?
What if China loses a war like that?
As robust as they are as an industrial power, the petroyuan is far too vulnerable to geopolitical manipulation. Those nations who invest in it will lose their ass. The petrodollar will remain the reserve currency on the basis of its defensibility.
That's a very myopic and quaint understanding of East-Asian geopolitics. Study what happened in Chinese finance in the lead-in to the Manchurian invasion, and the consequences for the central government.