The war with Iran very likely will weaken USA. As a result it will weaken Israel and Israel will be forced to modify its basic policies in the direction of radical compromise with Muslim neighbors and to established closer relations with the European countries.
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You seem to be fearing current conditions. America was not made weaker by war with Japan and Germany. It was made the most powerful nation in the world.
In this current climate the people of America have not sacrificed their comfortable life styles. They have not struggled with shortages that radicallly change their daily lives. They have not suffered the loss of hundreds of thousand of young people. These were the burdens of the war with the Axis. Are we capable of less than our grandparents? Is less demanded of us?
If Bush has failed to rally us to sacrifice it is because the demand for sacrifice is not yet required. The day will come when we will know that we are at war....
Some wars makes countries stronger, some make weaker.