Ah yes, threads like these make it all worthwhile: let's push a shady internet currency onto a poor nation who experiences one of the worst internet censorship in the world, severe currency control, impending war and subsequent communication blackout.
As for the economics of it, the first poster in the "Dire straits" link above has it just right:
The people in Iran currently have IRR. Your long story short: IRR is useless to people outside Iran: there is no way to get it out of the country.
From the perspective of someone physically outside Iran, that means Iranian people have no money. Thus, they cant /buy/ Bitcoin from someone abroad directly.