Main issue is one of scalability: they get a few conscripts covering their one airport and they're done.

Given some of the crap I've seen/faced going through various Israeli checkpoints though, it's just not a system I would want to see implemented in my own country. Anyone can feel free to disagree, but personally I think people should be able to travel freely within their own country without being treated as criminals (or sexually assaulted to prove their innocence, of course).