That's an interesting question. From my point of view, I'm not sure where the cut off point would be, or if it was just a gradual slide from introducing new ideas to incorporating already existing ideas. I am also convinced that science fiction went from introducing new ideas to presenting cautionary tales and then started following existing trends. I don't think science fiction creates new ideas as much now as it did, say, 100 years ago. What was written in many cases wasn't happening at all, the writing was straight from imagination. It didn't have to be blueprint accurate, it just had to make people think of how things could be done differently. I would say that the space pioneers of the 60s got their start from ideas that were presented as science fiction in their youth. 100 years ago, in the field of electricity, just watching someone do something unique caused other people to do unique things. Today, there are so many things happening that the writing could be lagging behind introducing new ideas and instead makes more use of already existing things and ideas. Telephones, airplanes, toilets, are all ideas that came into existence over 100 years ago, but haven't been replaced by radically new methods. They have become a lot fancier over the years but that isn't real change. I think people want to go to space today because they have already seen people doing it, not because they watched Star Trek, Babylon Five, etc. I am also of the opinion that incorporating social drama is good for opening up people's mind socially but isn't going to change things technologically unless the story contains truly new ideas about technology.