DMV's are routinely mocked as striking epitomes of government inefficiency, and yet most people put up with them on a very infrequent basis to renew a license, get a permit for a teenager, etc. Everyone hates doing it, everyone acknowledges it sucks, but since the general public is only forced to patronize one every few years, it's easy to dismiss. It's easy to think "Oh, I was just here on a busy day/time, I'm sure the line isn't normally this long."
Of course, if you visited the DMV weekly for years at a time, it would be enough to make your blood boil. But if there is a drivertalk.com, I doubt the DMV would be subject to even one-tenth the vitriol that we direct towards the TSA because the vast majority of the public just doesn't interact with it enough.
One experience, no matter how egregiously terrible, is rarely enough to inspire any behavior change. Think of a restaurant or grocery store or pretty much any retail outlet where you had a negative experience. Short of being physically assualted or robbed, one long line or a lousy clerk is not likely to dissuade you from returning.
Those who fly frequently clearly have a valuable perspective and insight into truly how terrible the TSA, its procedures, management, and employees truly are. However, I'm not sure what, if anything, can be done to share this experience in a meaningful way that will produce any substantial result.