That's one very interesting idea. Offering citizenship and facilitating immigration will slowly brain-drain Iran which will, eventually, cause economic collapse a couple decades from now.

The only downside is that Iran's political environment already shows strong signs of brain drainage.

- Iran sending "moles" to spy Israel or other countries.

- They would become terrorist targets (for being traitors to the regime).

- Some of them, even when they are against the government, are also against Israel. Religion is too much strong there.

And anyway, I think that they can ask for political asylum for their own, while visiting other countries (but I dont know if they are free to travel).