1. But there WAS a mini 911 in Florida, when the young man flew the C172 into a building, so it can be done. He managed to kill himself and burn out one room. And since he was a student pilot with access to however many keys were needed to get the airplane into the air, this security garbage would have not had any effect on the outcome.
2.. Most people who break into light airplanes do so to get the radios, hand-held GPS etc and door locks only mean an extra bill for repairs.
3. What about the damage the $30 "club" will do when you have a landing incident or abandoned takeoff? Will the government mandate secure storage for these items when not actually being used to lock the flight controls?
4. If you fly in the US and you are female, expect to be groped. Wait; they have changed that as a result of being too aggressive and stirred up too many complaints, so now if you are female and want to carry something on board, put it in your bra since the screeners will take special care not to actually touch you there.
5. etc.