It's all or nothing as you said.
On a side note, if Iran is not going to build the bomb after all this, then maybe it's better that the regime gives up before Iran is destroyed. Once we go down the path of attrition warfare, it will be impossible to stop it without suffering severe infrastructure damages. And unlike Ukraine, we will not be gifted $300 billion to keep fighting.
I have been saying that Iran needs nukes on this forum for more than 15 years, since when I was a very young teenager with very little knowledge about the world affairs. Back then, I thought of it as something that Iran needed to do for its prestige and for cementing our status as a power. 15 years later, nothing has changed about my opinion except that this time Iran's survival is at stake and without nukes, we're cooked.
Even if we win this round, they won't leave us alone. They'll continue their isolation and economic pressure, this time will even add reparations to it, until we implode from within. Only nukes can stop this cycle of war and internal instability.