By "petrodollar" do you suggest that IOTA tokens would be the most liquid asset against all other assets like XRP has the most liquidity against all currencies in Ripple?
No, I did not. It is just an analogy. All cryptos still have long way to go to get to a meaningful point. It requires extremely hard work for everyone. You can find more use cases from David's article -
https://medium.com/@DavidSonstebo/iota-97592581f985#.73h281bxh