One way to get some insight into this is to look at the demographic break down of Iran pre and post 1979 revolution.

https://en.wikipedia.org/wiki/Demographics_of_Iran#Religious...

Pre-1979, per the 1976 census, Iran had a Jewish population of 62,258 (0.2%). Post-revolution it immediately fell to ~9k, where it has remained - at least until the last census in 2016 (0.0% representation).

While Christian representation didn't decline by the same amount, it took a sharp decline as well. Pre revolution (1976) saw a Christian representation of around 0.5%. 30 years later (2006 census) it was 0.2%.

What conclusions you should draw from that are open to interpretation... and when it comes to life in the Middle East and North Africa, you can also draw relative comparisons (is Iran worse or better for these groups?). But it's usually not a good sign when the population of an ethic or religious minority takes a sharp and sudden decline.

In the case of the Jewish population, Israel is relatively close, with a comparatively higher standard of living and free entry, and there is a strong incentive for Jews to emigrate there even in the absence of hostility or outside pressure.