I work with and know a lot of Shia (non-Iranian) Muslims and listening to them talk about this assassination I'm convinced that the likelihood of attempted terror attacks against the US has increased significantly. The non-Iranian part is key. Millions of muslims around the world viewed the Iranian theocracy as the only power in the world fighting for Islam. They are devastated.
I can't recommend Heretic by Ayaan Hirsi Ali enough.
The Qur'an is totally prescriptive. It contains direct legal commands, judicial rules and explicit government principles which are all binding and considered as direct divine speech.
I think Westernisation and an increase in the number of "casual" muslims is and will continue to be the moderating effect.
Think of what is happening in Europe (as the clearest example) with the influx of Muslim immigrants who raise increasingly more assimilated children as the blueprint.