Inch scale vs. Foot scale
This gizmodo article points to two pieces arguing that since new smartphones have so much functionality, they may replace laptops. This is wrong. Post-It notes have as much functionality as legal pads, and yet we don't see one replacing the other. People want to do some tasks at the "inch-scale" and others at the "foot-scale" and that's all there is too it. Mark Weiser, and other people in the ubiquitous computing arena, have understood this since Parc. It's as true today.