Here are my thoughts
Will this make us any safe? Not likely
Do we have much choice? Not really
Will the US government/TSA screw this up? Most definitely
Will some files end up being saved and in the wrong hands? Definitely - the US government has a history of letting heavily secured, secret files into the wrong hands from Homeland Security, IRS, CIA, etc.
Will some bored, underpaid TSA agent eventually find a way to save imagies and post on
Youtube? Quicker than you think and most liely not you, but some "celebrity"
Do I care if my naked scanned image does appear? Not even a little bit
Will the govenment eventually relase a contradictory study saying it could be unsafe? Most likely - this is the governemnt that told us cyclamates, red dye number 2, thalidomide, etc were all safe at one time.
Summary- Who cares? In the end we all die some time, stop sweating what you cannot control