David Kilcullen and Bruce Hoffman, the dean of terrorism studies, have advocated for years.

CNN: Commentary: How Obama should run war on terror

But pundits such as Bruce Hoffman, of Georgetown University in Washington, think the impact will be marginal.

ECONOMIST: Terrorism

And, Bruce Hoffman, perhaps I've begged the question by saying the insurgents have organized all the suicide bombings.

NPR: Behind the Workings of Suicide Bombers

Bruce Hoffman, who runs the Rand Institute's Washington office, agreed the numbers are up largely because of Iraq.

CNN: Terror by the numbers

"We believed we had turned the corner with these kinds of threats, " says Georgetown University's Bruce Hoffman, author of Inside Terrorism.

BBC: Boston Marathon blasts 'felt like 9/11'