The cause is information overload, the constant bombardment of trivia--"data smog"--emanating from television, radio, print and Internet sources. The effect we call "information aphasia" or "infasia", a declining ability and desire to retain details.
We ask ourselves: "Why commit to memory what we can web search at will?"
This facility of research and fact checking, coupled with the difficulty to perform on our feet, leads inevitably to a processing paradox. As Pearl says: "We know everything and nothing."
Everyone understands that poetry was replaced by song lyrics in the 1920s and that copyright law was the coup de grace. The casual sharing of work on the Internet has all but solved the latter problem. The former might be overcome by education and expertise in verse writing and presentation (e.g. performance, multimedia, networking, integration, et cetera). Presently, the greatest challenge facing poetry is infasia, a problem that promises to get worse long before it gets better.
The good news is that the cure is simplicity itself.