What would you suggest threatening a suicide bomber with?
That something unpleasant happen to his entire extended family. Then families would watch for symptoms of a member thinking of becoming a suicide bomber, and take him down first
It is possible that over time the movement itself can be deterred. Their goals are irrational, but their decision-making and tactics are intensely rational. If suicide bombing seems not to work, or is resulting in this ideological loss of more and more population centers, they might decide that it just isn't worth the trouble anymore. But something will probably have to change in radical Islam for that to happen.
Have you seen that "poll" on the opinion of Iraqis on Alqeda? The biggest deterrent is social ostracism. Enforcement with consequences also reduces the lure and appeal of antisocial activity. There are many things one could threaten a suicide bomber with. How about a Vengeful Virgins vendetta? :)
Life in prison, with Hitlery Clinton and Helen Thomas as cellmates.