It actually isn't. What is needed for security is better humint, better sigint only increases the stack of hay that the same number of needles has to hide in.
Note that in a very large number of terrorist attacks the knowledge was already available, but it either wasn't acted on, communicated improperly, not given enough urgency or lost because too much time was spent looking at spurious signals. Every time the amount of information available goes up that last factor will grow. Signal vs noise is the main contributor in why 9/11 happened, and the same goes for a lot of other terror attacks as well. But that sort of admission requires a complete review of how this is all practiced, would require an end to the security theater and would cut a whole lot of pork. I'm somewhat skeptical that this will happen.
But more security theater moves to appease Joe Public and look tough, of course.