This would be the beginning of a new war, not the end.
I believe the difficulty of destroying Fordow is probably behind the regime change strategy, if you could get a friendly regime in Tehran, then you could get inspectors and agents into Fordow and dismantle it without using very large weapons.
I’m all for regime change in Iran personally but I note with some cynicism the number of times I’ve heard over a long lifetime that Iran was very close to having a nuclear weapon. They must have some of the slowest research programs ever devised. Of course losing successive groups of researchers to misadventure may play a role in that.