Civil disobedience is luckily not the only way to reverse policy decisions. The topic seems to pick up a lot of steam even without masses of people refusing to be scanned. (I was very surprised to see that Spiegel Online [1] – one of the most popular if not the most popular news website in Germany – has the planned Thanksgiving boycott as its top-story [2] at the moment. That’s irrelevant for the discussion in the US but it shows that it’s a hot topic.)
Agreed. I think organized synchronized boycotts would be much more effective than doing "civil disobedience" and/or drama queen shenanigans at the airport. Hit airlines in their wallet (and the related travel industries), and that will have a larger effect. Money talks. Large amounts of money talk loudly, especially to Congress.
[1] http://www.spiegel.de
[2] Pilots and Passangers Revolt Against Check Lunacy: http://www.spiegel.de/reise/aktuell/0,1518,729012,00.html