Paul Goat Allen has written an insightful article at the Barnes & Noble book club blog, discussing the question of whether the Science Fiction genre is dying or not. A pair of noteworthy sections cite George R.R. Martin and his Wisconsin Public Radio interview from 2008 in which he puts forward his viewpoint as to the reasons for the decline of popularity of Science Fiction, and his personal feelings on what fantasy has to offer to readers. The interview contains Martin reading his brief essay on fantasy at around the 14:50 minute mark of the interview.
You can find much more from Martin by way of his correspondence with fans, on-line chats, and printed, audio, or video interviews at Westeros.org’s Citadel site, in the So Spake Martin collection.