Well, according to Discover Magazine it is. Article here. Some interesting comments about the founding fathers of the genre (Verne, Wells) and one quote I did enjoy was "why are the science fiction shelves of bookstores glutted with brightly colored works of “fantasy” whose protagonists, judging by the covers, are shirtless bodybuilders with Thor hairstyles fighting dragons with swords?" A discussion thread about the article is on Westeros.
I do think, sometimes, that I can see Sci-Fi ideas that I read about only a few years ago turning into reality at a quite breath taking speed if you dwell on it. Roll on the Culture!