http://techland.time.com/2012/01/23/why-we-wont-see-many-protests-like-the-sopa-blackout/
I think he is right as to the specific issue of the web blackout. I would add one other feature, the widespread general disgust with getting blown off by elected officials and the MPAA. But the fact that this most extreme (and desperate) of tactics is unlikely to be repeated does not make this a one off and we return entirely to business as usual.