BTW, there is a great interview with Edmonson here: [www.tracksounds.com]
The Le Guin/Martin piece seems to focus on the "outsiders who don't understand us denigrating what we do" approach, and their solution is to get rid of the genre labels that carry the cultural baggage. But that doesn't help answer the question of whether genre terms actually have meaning or might be useful at least some of the time. Martin gets at this a bit with his "fantasy and SF are the same thing with different furniture" theory. Too bad I think he's almost totally wrong.
Totally unrelated note: Le Guin's last name has a space in it. For the love of FSM, can you fix the spelling on the post so people stop perpetuating this spaceless version?
Now, Margaret Atwood is a genre denier...
As for the list... I think "The Matrix" really ought to be there. It's a great movie AND it was hugely influential. Kind of a no-brainer. I'd probably toss "Back to the Future" to make room for it. I also really like "Children of Men", but not enough to go to bat for it when it only came out in 2007. (The AFI's criteria include "Popularity Over Time" and "Historical Significance".)
Outside of the visuals, though... I think Battlestar owes a lot more to Space: Above and Beyond and Star Trek: Deep Space Nine (a show Ronald Moore wrote for from 1994-1999) than Firefly or Farscape. Personally, I am not interested in ranking BSG against Firefly or Farscape; I love them all in their different ways. In fact, it gave me a weird feeling when I heard that Joss Whedon was interested in writing an episode of BSG's 4th season. I don't know if I am disappointed or glad that he'll probably be too caught up in his new show Dollhouse to manage it.