Our brains are shrinking, and this is a good thing. Having read, long ago, Stephen Jay Gould’s book The Mismeasure of Man, I’d argue it’s probably an irrelevant thing: the quality of brains is not effectively measured by their size. Otherwise, elephants would be running Congress and the shutdown wouldn’t have occurred.
But this is sort of Jeff Stibel’s point in Breakpoint (subtitled ‘Why the Web will Implode, Search will be Obsolete, and Everything Else you Need to Know about Technology is in Your Brain’): highly interconnected systems grow like crazy until they reach some inherently unsustainable size limit and then they break.