Big Brother in the Classroom?

I've been thinking a lot lately about The New York Times article that I retitled "Big Brother in the Classroom." Honestly, could we teachers one day have video recordings of our lessons as a means of evaluation? If this happens, what's next? Could this morph into something terrible, like having permanent cameras in the room that would allow principals, administrators, and other teachers to constantly observe and critique? I invite anybody to come into my classroom at any time, even vulpine observers, but I have to draw the line at my classroom door when it comes to using cameras to record what I do without my approval. This comes dangerously close to the stuff of 1984.