This is no silver bullet for terrorism. I don't see a rational, logical connection.
On the other hand, the point is well served regarding consumer protection. Mischievously I will add that I see a growing trend between two classes of traveller: the frequent more wealthy NEXUS crowd, and the hoi polloi. To get around the concern about security, pay $50 and go to the front of the queue, business class. For everyone else, it's economy, and we'll call you when it's time to board.