Difficult decisions lay ahead, a nuclear armed Iran will in effect be another N.Korea in the middle east, in other words almost impossible to deal with, what then? it'll be too late to restrain Iran at that point, other than sanctions which works so well against rogue nuclear states and unle NK, Iran has oil, so they'll always be India and China etc willing to trade.
I think Israel will seek to attack Irans nuclear program, which they have done before, the current Israeli Govt is far more hawkish.
Iran launched over 100 ballistic and cruise missiles at Israel, yes they were shot down but thats not a given and it'll take time to replenish the missile defence systems and at huge cost.
300 missiles and attack drones is an act of war in anyone's book.