The future depicted in a good SF story ought to be in fact possible, or at least plausible. That means that the writer should be able to convince the reader (and himself) that the wonders he is describing really can come true... and that gets tricky when you take a good, hard look at the world around you.
Frederik PohlPeople as me how I do research for my science fiction. The answer is, I never do any research.
Frederik PohlYou don't think progress goes in a straight line, do you? Do you recognize that it is an ascending, accelerating, maybe even exponential curve? It takes hell's own time to get started, but when it goes it goes like a bomb.
Frederik PohlIn terms of stories I would buy for a science fiction magazine, if they take place in the future, that might do it.
Frederik Pohl