I definitely think a lot of people are afraid to write SF -- because they're afraid of science. There's so much to get right when you want your story to fit within the parameters of reality. There's research to do! Embarrassment to be had! But that doesn't mean it's not something worth doing. Writing is one of the best ways to explore the nature of humanity, and what's more worthwhile than skewering the human condition with the most exciting crap technology can dish out? :D
By science fiction, we Inkpunks are restricting ourselves only to fiction that works within the generally accepted rules of nature. So the piece can be a mundane work or a near-future dystopian or a post-apocalyptic adventure ... it just can't have magic or elements that make zero sense within the boundaries of modern science. Zombies--the undead kind--are pretty much out. Witches, too. (What the heck am I going to write about?!?! Isn't everything I write about zombies or witches?)
If you're a writer who reads this blog, I throw the gauntlet at you, too. The world needs more great science fiction. It's science fiction that fed the hearts and imaginations of the mid-century American scientists who took us to the moon. It's science fiction that stirred the dreams of the great twentieth century inventors. Let's give the next century something to talk about!
PS: If you're already on-board the science fiction train, I know that right now the Science in My Fiction site is running its 2nd annual short story contest. Go send them something exciting!