Most Iranis in the UK (and they REFUSE To be called Irani, preferring to be called Persian as the term Irani seems infused with memories of the Ayatollah), hateIslam but don't want to speak up. These incidents are cracks in the wall. I definitely see Iran cracking and breaking away from the moon cult. However, do note that I suspect most will become Zoroastrian (the ancient Persian religion) but many would become Christian too.
Zoroastrians do not accept converts. You must be born one to be one. It is highly doubtful that millions of Iranians are going to leave Islam because of the mullahs. Human nature doesn't work that way. Christians cleaned up Christianity during the protestant reformation. Expect the Iranians to do the same.