WW2, Korea and Vietnam were all far bigger than the campaign you will see between the world and the terrorist, with much greater effects on economic and human activity. Throughout, aviation continued and even prospered.
The events of 11th September do not compare to any of the above events in history. The loss of confidence has been profound and sudden, unlike the slower unfolding of events in those wars. Nevertheless, appropriate action will be taken to restore confidence and, as long as personal wealth contines to increase (and it will), passengers will return to the airlines. The historical trend of ever-increasing air traffic will eventually resume until and unless the world gets fed up with going on holiday, or moving freight, or we all get our own home holodecks.
If you want to give up, you are of course at liberty to do that, but your logic in doing so because of this one event is no better than that of the passengers who now don't want to fly, yet get in a car every day.