Well, the stage is set to our having tried diplomacy. When sanctions don't work, who will it be taking out the nuclear sites? Us or Israel?
I'm not sure anyone can take them out from the air. Iran has buried these facilities under mountains. Seems an invasion would be needed to ensure they are destroyed in any event. Iran learned a lesson after the Israelis took out their reactor in the 1980s.
Unless they use nukes, Israel doesn't have ability to strike Iran in any meaningful way.
We have the ability, but don't have the will.
Isreal will be doing it with some help from us. We will probably supply them with some nice bumker buster bombs and the sorts.