The article focuses on "everyday object" manipulation, but he's right about technology too: there are a wealth of common HCI tools that glass cannot accommodate

The article focuses on "everyday object" manipulation, but he's right about technology too: there are a wealth of common HCI tools that glass cannot accommodate. - The textual keyboard remains one of the fastest methods of text entry. It can be used without looking, offers high bandwidth, affords both serial and chorded inputs, and works well for precise navigation in discrete spaces, like text, spreadsheets, sets of objects like forms, layers, flowcharts, etc. - MIDI keyboards are comparable, but trade discrete bandwidth for the expressiveness of pressure modulation. - The joystick (and associated interfaces like wheels, pedals, etc) are excellent tools for orienting. They can also offer precise haptic feedback through vibration and resistance. - The stylus is an unparalleled instrument for HCI operations involving continuous two dimensional spaces. It takes advantage of fine dexterity in a way that mice cannot, offering position, pressure (or simply contact), altitude, angle, and tip discrimination. - Trackballs and mice are excellent tools for analogue positional input with widely varying velocities. You can seek both finely and rapidly, taking advantage of varying grips. Trackballs offer the added tactile benefits of inertia and operating on an infinite substrate. - Dials, wheels. A well-made dial is almost always faster and more precise than up-down digital controls. They offer instant visual feedback, precise tuning, spatial discrimination, variable velocities, can be used without looking, and can be adapted for multiple resolutions. - Sliders. Offers many of the advantages of dials--smooth control with feedback, usable without looking--but in a linear space. Trades an infinite domain for linear manipulation/display, easier layout and use in flat or crowded orientations. And these are just some of the popular ones. You've got VR headsets for immersive 3d audio and video, haptic gloves or suits, sometimes with cabling for precise pressure and force vector feedback, variable-attitude simulators, etc. There are weirder options as well--implanted magnets or electrode arrays to simulate vision, hearing, heat, taste, etc... Dedicated interfaces can perform far better at specific tasks, but glass interfaces offer reconfigurability at low cost. That's why sound engineers have physical mixer boards, writers are using pens or keyboards, artists are using Wacom tablets, nuclear physicists are staring at fine-tuning knobs, and motorcyclists are steering with bars, grips, and body positioning; but everyday people are enjoying using their ipad to perform similar tasks. Glass isn't going to wipe out physical interfaces; it's just a flexible tool in an expanding space of interaction techniques. More and more devices, I predict, will incorporate multitouch displays along dedicated hardware to solve problems in a balanced way.