I think that with the current situation, it would be virtually impossible for the US to loose a war with anyone much less a bunch of poorly trained (as soldiers), low-tech fanatics. Has anyone seen the movie "Blackhawk Down"? True story, and at the end of the movie they said that over 1000 Samalis (sp?) had been killed and 19 Americans had been killed. That was on Samali ground and the American soldiers were ambused. That's quite a difference in number dead.
Look, we might eventually decide that being involved in the middle east isn't worth the trouble it's causing us, and we may pull out. However, I don't think we will ever be forced out, and I certainly don't think we will loose to the terrorists. If push ever came to shove, I think the "war" would be over in about five minutes. Terrorists do not have nuclear weapons, or high tech bombers, or well trained special forces units or any of the other advantages the US has in an all out war. And terrorists also need a country to hide in and support them. So I ask you all, name one country that could stand up to the US if it came to all out war.
Don't kid yourselves, the terrorists may have training camps, and they may have weapons, and they may have religious fanaticism, but they wouldn't have a prayer in an all out conflict with even the US (not to mention the rest of the world).