There was no Philip Roth book published this year. No Roth book was published last year. And unless something changes drastically, no Roth book will be published in 2014. Nathan Zuckerman — Roth’s author ego, who first appeared in the 1974 book “My Life as a Man” and presumably exited himself in “Exit Ghost” in 2007 — is gone. And yet, Roth himself, now 80, lives on.