I am not trying to defend the TSA, mind you, but it has long been their practice to alter/add additional security without announcing/publicizing it. This can be bothersome, true, but one doesn't want bad guys to be too sure what will be expected of them as they try to pass through Security. As the OP notes, you can still get through Security without having a second ID, you'll simply come under additional scrutiny. Again, let me reiterate, I am not advocating such measures nor suggesting they are effective; I'm merely pointing out that they are nothing new.