Kudos, but NOT FAST ENOUGH. Nor is it a warranty that the private companies will avoid indecent grope-em-ups and debasing porno-scanners.
BVW, you are correct a private company could be just as bad as the TSA but...an airport authority can always fire a private company and bring in a better one. Its really difficult to fire a federal agency.
Also, I have a feeling that private companies will be far more customer oriented and flexible about the job because of the competitive nature of the private sector.