I really hope it won't come to that.
I am confident that Israel alone is not able to inflict severe damage to our nuclear infrastructure.
As for the US, I still think that Trump is going to chicken out in the last minute. He doesn't want a full-blown war with Iran. So, the only thing that can change this equation is if he gets assured that Iran will not turn this into a war, or acquire nukes after the attack. Once he is assured of that, he will greenlight it. Some factions in the regime, including even Khamenei and the IRGC, are giving Trump that assurance by saying that they do not want nuclear weapons.
We need to understand that the IR has completely lost deterrence after their weak responses to the assassination of Gen. Soleimani, Fakhrizadeh and Israeli aggressions on our embassy, assassination of Ismail Haniyeh in Tehran and aggression against our mainland.
If you watch McKenzy's interview with 60 minutes, he explicitly said that when Trump cleared the plan for assassination of Soleimani, he took a deep breath and was extremely nervous. They expected a decisive Iranian response. The US was afraid of Iran, but the fear is no longer there after Ain al-Assad and TP1, and TP2.