NYT article on how the album is falling off and the single (mp3 track purchase, ringtones, etc) is coming back.
Classic albums to me are the most timeless article of pop culture. Illmatic or No Jacket Required are still great today a decade+ after they were made. OTOH other things such as books or movies, don't have much replay value to me, even if they're classic.
So I hope the album doesn't fall off, but I doubt it will though for quality artists with loyal fanbases.