Nope.
Thats recisely the jihadist strategy.
Thats why this planned madness with wanton killings and bombings and bloodletting. Everyday. Ceaselessly. Droip drip drip.
All picture opportunities of blood and gore for the news cycle with no tactical or strategic value in pure military terms.
I believe that if they had the ability they would do alot more than drip, drip, drip. I do not think they would purposefully hold off larger attacks.
Certainly they have wanted to do much larger attacks and not just in the Middle East. They just haven't been successful because we have caught them in their planning stages.
Mark Steyn is trying to assert in this article that they are purposefully not doing large attacks on American soil as part of their strategy but the recent large scale attempt that was thwarted in London, which was headed for America, disproves his thinking.
They would, if they could.