I bet the companies that provide millimeter-wave scanners to the US government (i.e. the thingies that electronically strip-search folk) are popping champagne and thanking their good fortunes. Since this ding-dong of a terrorist allegedly hid his 'cargo' in his underwear, there was no way to detect it, short of strip-searching him. I expect lots of false-positive for everyone under 60 who has to wear adult diapers in the future... Once 'on-body' smuggling becomes difficult I expect to see greater focus on 'in-body' smuggling in conjunction with carry-on smuggling. The X-Ray machines in use today are perhaps a step up from the old black-and-white models in years past, but the human operator remains a very weak spot. Not every pattern will be recognizable, especially if someone with ill intentions positions the item/carry-on optimally to avoid detection.
Anyway, the usual security theater aside, what irks me more than anything is that US airport infrastructure has not kept up with the expanding space requirements to host said theater. For example, the millimeter scanners I have seen in operation are slow and take up a lot of room. So, to process the same number of passengers, far more millimeter scanners are needed than the walk-through magnetic detectors they replace. Yet, no additional space is provided to create more parallel paths into the 'secure' area of the airport. Anywhere...
It's simply amazing that with all the stimulus funds being spent left and right on infrastructure that no one can be bothered to redesign airports around bigger screening areas that can actually handle expected flows of traffic. Naturally, a better response would be to scale back the theater and simply acknowledge that the government cannot protect every citizen from every crime and live with the consequences - but I'll limit that fantasy to the rational place where it belongs as opposed to the irrational place the TSA is creating for the traveling public.
As for the question of how the TSA will react to the latest bombing plot, I simply point to past responses. The folk who run this organization appear to be very reactive as opposed to pro-active. Furthermore, I doubt that the appointees by the Obama administration have even begun to to steer the mish-mash of a federal bureaucracy that they have inherited. Given how long it takes for federal rules to get proposed, reviewed, signed-off, etc. I doubt we will see real 'Obama' policy at the TSA in effect until sometime next year. In the meantime, the remaining Bush-era rules are getting discussed, pushed through, etc.