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Oil trading is not the bulk of dollar transactions in the world, and Iran most certainly is involved in but a very small fraction of dollar transactions, so in effect, your link means basically nothing, and he is correct.

What data is that?

Your link indicates Iran provides 15% of the Persian Gulf countries total energy exports.

The US gets about 20% of its oil from all the Persian Gulf countries combined making Iran about 3% of what we use.

Oil is a small percentage of our economy - and also the world's economy in terms of costs verses total production (not dependence).

Iran could disappear from the face of the planet and it would only make a slight bump in the world economy. They hardly have the economic clout to inflict all the damage you fear.

In addition few are likely going to want to play on Iran's new oil exchange. Traders demand basic law to uphold their contracts that isn't based on a dictator's whims of the day. They also demand transparency on their financial transactions. Iran can provide neither.

Oops, I made a mistake...

Iran's oil is about 3% of the total imports to the US (15% of the 20% we import from the Persian Gulf countries). We import about half our oil. So Iran's oil is about 1.5% of the total oil we use here in the US.

In countries that import all of their oil Iran is about 3% of that total import.