Self boarding on airlines

Continental Airlines announced that they are testing self-boarding at the Houston airport. Now this practice has been in place in other countries for over 10 years, so it is appropriate that the antiquated US airline system would finally get around to trying it. It has the potential to reduce more headcount for the airlines. But, I have a few questions. Who will check to make sure that someone doesn't try to bring a 54' TV as carry on baggage? Who will check that the crowders (you know who you are) don't board before their row is called? Who will frown at you when you present your boarding pass? And who is going give me the last first class seat? These are the questions that will determine success or failure, do you agree?