I don't think so. The gov'ts of Syria, Iraq, Iran, and Saudi Arabia all finance terrorist activities, so they are by definition terrorist orgs themselves. So we won't be solving the problem by taking out a few Al Qaeda, Hamas, and Hizbollah leaders. Those people are replacable. Solving the problem requires regime changes in the above mentioned nations (among others), and this can only be accomplished by a full scale war.
I wouldn't be too sure about that.
Suppose somebody took out Syria's Bashar Assad -- Syria may well experience a serious power struggle that takes them out of the game: it almost happened when the elder Assad died.
Similarly, taking out Saddam and a few of his closest friends would throw Iraq into chaos.
Iran is probably the biggest problem, though there are apparently some rumblings of real discontent with the leadership there. Direct assault would be counter-productive, and it probably wouldn't work to simply take out Iranian leaders; however, it may well be possible to find, groom, and arm a dissident movement.
The Saudis are a whole different story. They're cravenly paying off both sides in order to stay in power. If the other terrorist states dissolve, I suspect the Saudis will go after the terrorists themselves, as they represent the greatest danger to the Saudi regime.