They weren't going to build one, their religious leader forbade it.
But we killed him. That would be like someone killing the pope or one of Israel's top rabbis. Our leader are so dumb, they have no idea what they have done.
. . . but now the new leadership of Iran knows they need one, so now they will.
Next time anyone invades them, they will use it.
. . . and I am doubtful that we can overthrow their government. The Chinese & Russians only need to do what they have been doing, sharing their satellite data.
The only way we can effect regime change is by putting boots on the ground, because now that Trump has said he won't accept anything less than total surrender. No way Trump can force a total surrender unless we put boots on the ground.
W/O a declaration of war, or war powers resolution which the congress just refused to pass, it will be illegal to draft anyone. That will go to court, and I imagine the administration will lose.
There aren't enough representatives and Senators willing to sell their soul to pass an authorization of force, or declare war.
SO no, I doubt very seriously their regime will die. Any attempt on our part to make the Iranian regime die will spell the end of this great nation.