> If Iran has stockpiles

And launchers.

> of those drones can be used to hit Oil Tankers ... if there are enough muntions, it will be bad

Not really. During the Iran-Iraq war hundreds of tankers were sunk, including in the Strait [1]. Iran's supposed 'nuclear' option was mining the Strait. But for whatever reason, they weren't able to or chose not to do that.

> this is going to be an interesting form of attrition on all sides

I'm sceptical of this read. With missiles, the launchers are the weak link. With drones, the factories. In the meantime, the U.S. gets to refine the anti-drone kit it's been working on (based on lessons from Ukraine and the attacks on the Houthis).

[1] https://en.wikipedia.org/wiki/Tanker_war