You don't even need to trade oil, trading gulf country assets also works well. And rebuilding the gulf should be quite profitable if Iran blows it up and the assets will be available cheap.
> And rebuilding the gulf should be quite profitable
Wait. I've heard this story before. Let's ask any of the recently "liberated" countries how that worked out for them...
Iran can't blow the gulf up in any meaningful sense, even if the war continues for a long time.
It can blow up a few high ROI targets, but that ROI isn't from the cost of rebuilding - it's from the opportunity cost of not having them.