What's going to finally change this is when there's a particularly bad day, and security lines are likely to make enough people late, that a swarm effect happen

What's going to finally change this is when there's a particularly bad day, and security lines are likely to make enough people late, that a swarm effect happens and a mass of people just says "no more" and walks through. Just like the fences at outdoor concerts. It takes a few fearless/stupid people to break through, and progressively less fearless/stupid individuals to follow, having watched enough ahead of them follow. Once the video of this gets out, it'll happen again, and again, "like that time in that other airport!", and eventually, we'll end up with sane rules, or no one will fly because it'll become so prohibitively expensive to fund the theater (and then the airlines will get government bailouts)