I have stated this in the past.

There will be no terrorist attack by Al Queda in the U.S. for a period of 10 years after 9/11.

These people are very methodical and patient. Planning such an attack requires immense effort and slow and careful assembly of people and parts. This cannot even begin to happen until the U.S. calms down and is not as vigilant.

After the country gets back to business as usual, and it eventually will, then Al Queda, if it exists in a sufficiently cohesive group, may attempt another attack.

You cannot credit this administration with stopping anything. However, the significant alert status to even slight misbehavior by any Muslim citizen or non-citizen will certainly be noticed by Al Queda. They will simply bide their time until the future. No need to attack the U.S. when it is already running around like a stupid chicken with no head.