You can see this trend in most technology products. Increasing subtleties and functions are added improving what a product can do. At some point, the complexity is sufficient to force us to focus efforts on simplification (or the benefit great enough that a simpler technology will take over) - while maintaining functionality. Classic menus migrating to context-sensitive menus; the original NES controller, to the xbox controller to Wii and Kinect control, Yahoo’s list-the-web, to Google’s search the web, multiple glasses to photochromic glasses, and so on.
I believe this observation is from Edward De Bono, but I learned it from Darrell Mann. I keep finding it helpful.