There is a sense that more of something means less of something else. Perhaps this is true in terms of market share, but it doesn't happen to be true in device

There is a sense that more of something means less of something else. Perhaps this is true in terms of market share, but it doesn't happen to be true in devices. TVs didn't kill talk radio, though radio may have shrunk. The PC didn't kill TV, though TV may have been augmented, and perhaps shrunk. Mobiles didn't kill PCs, though PC use may have shrunk. This idea that the web will be completely replaced by Facebook and mobile apps is crazy. It's just another layer in a multi-technology world.