Iran as existential threat?

Again, I say no, at least, not in the way that Mr. Netanyahu is proclaiming . . . but a recent poll suggests that many Israelis believe so, and that almost 1 in 4 Israelis would consider leaving Israel if Iran were to develop a nuclear weapon. Certainly an existential threat of a different order, in that it undercuts the Zionist imperative of attracting settlers to Palestine

Also, almost half of those polled believe that the IDF should attack Iran's nuclear facilities. I suppose the pollsters didn't mention any caveat about the Bushehr reactor possibly being blown up.