At present, it seems, Traditional Zoroastrianism defines all religions as equal (the Righteous of all faiths will enter into heaven) and does not accept converts . On this view, Zoroastrianism is for the "Aryans" (pre-Hitler sense) and Zoroastrians are prohibited from marrying outside their ethnic community.
On the other hand, the Wikipedia article linked above says that "there is a growing interest among Kurdish people of various national backgrounds, as well as peoples in various Central Asian countries such as Tajikistan and Kazakhstan, in their ancient Zoroastrian heritage; many people in these countries now consider themselves Zoroastrian." and other sources suggest that there is a "liberal" wing that accepts or even encourages conversions. So perhaps Iranians would count as suitable adherents to some form of the religion.
As a Christian, I don't believe that all religions are equally true. But at the moral level, Zorastrianism has always seemed to me, on the basis of admittedly superficial knowledge, to be a religion that's at least fit for a gentleman.
Excellent post. I learned alot from it and the links. On face value, a revival of this religon could perhaps allow Persians, Kurds and others to distance themselves from Arabs without seemingly accepting Western Christianity. I will need to read much more now, but like you said, it seems civilized as opposed to Islam.