That's basically the question asked by this report.
The Risks of Defeating Al Qaeda in Iraq
Experts warn that jihadist fighters could carry their fight to other nations
President Bush claimed on Thursday that U.S. forces and Iraqi tribesman have "systematically dismantled" the terrorist group Al Qaeda in Iraq in the long-troubled Anbar Province. And indeed, while Al Qaeda in Iraq remains dangerous and active, particularly in parts of northern Iraq, the terrorist group is having increasing difficulty pulling off its signature type of attack, deadly car bombings...........continue with article.