In the face of rapid demographic, technological and political change, we must do everything we can to make our entire organization smarter and nimbler, which includes hiring and listening to new young librarians. The fact is that "what everyone knows" is sometimes wrong, which explains the extended time-lag between when a revolutionary new theory is proposed and when it is generally accepted as true: it's the time required for defenders of existing theories to die and get out of the way. [thanks celia]