Well, no, I wouldn't.... I think we have to be careful; with the system we have in place, there are no guarantees. It's not to say that we can't detect, they're just getting increasingly difficult to with the capability they have. Many of the cues we would have used in the past to be able to anticipate responding to those have diminished with technological advances.
I mean, I can't imagine precisely what the next system would look at, but it should be certainly able to address the threats as we perceive them.