Nope...the U.S. is already completely, totally, neutered.
The Iranians get the bomb and we get to live with whatever the outcome is...we no longer get to act, only react to world events. And our reactions will be most underwhelming.
If that is true, and it is very likely true, we will then have to deal with the Arab world's nuke race. It will be a disaster beyond compare. So far, 6 Arab nations have said they want "peaceful nuclear power" too. THAT is what Bush should remind the American people.