No, they did it because they have to be perceived as "DOING SOMETHING!"
And a bunch of tiny TFRs only affecting UAVs doesn't "do something", or rather do anything, to interfere with all other routing flight operations. They'll probably make a few highly publicized arrests of little Johnny with his toy drone, or maybe a real estate agent taking photos of his properties, the hysteria will subside, and in a month or two the newscritters will find something else to whip the public into a frenzy over.