I said that SF short fiction markets which support an editorial staff with money to live on are dying, and that's a rather different assertion. Science fiction is thriving in many other media, such as the novel, the television show and the movie, but the short story is becoming more of a "boutique" item in the field. Writers were never (or only rarely) able to make a living writing short stories, but editors generally managed to carve careers out for themselves by publishing them. That's becoming less of a true proposition.
Anyway, if my original posts were vague enough to be interpreted incorrectly, I hope I've made my position more clear now. And despite osewlarus's conflation of my position with two other other positions, his post is still very much worth reading if you're interested in the future of science fiction in general.