It's not gonna render them impervious to our airborne assets, don't worry. Nor would it be enough to deter the Israelis, interestingly enough. The IAF would still be able to hit most anything in Iran even with their logistical limitations, which means the USAF - especially with its arsenal of low-observability aircraft - would easily be able to circumvent the system. It's really gonna bolster the Iranians' bravado more than anything else, which many people would almost welcome at this point, since any sort of actual military engagement would be suicidal for Iran.
