I'll argue it's always been that way. It's Just that the pool of data that people are pulling from these days is more homogeneous. It used to be that people had a lot more unique and personal experiences that weren't known to the world. But today everything is shared and given a label by our culture. So if you come up with an idea it's much more likely that someone that has had similar experiences to you, thought of it already. People say there's no more new ideas. Maybe that's true in a sense, but I'd argue nothing's changed except that people know about all the ideas.