thank you for laugh Nicolas. I think too many people are focusing on the size of the display, with pico projects and wireless display interfaces, there will be nothing stopping users from from interacting with larger displays. In fact, your display could be anywhere. You will not need to carry it with you, which is the point. Moving away from traditional form factors is a challenges for those of us (me included) that have grown with them, but the next generation will not have that challenge. In fact, they will think the concept of lugging a display around as ludicrous. Wearable computers are coming, whether we like them or not.
I can see the day when, besides the military, law enforcement will take advantage of wearing computer glasses to instantaneously evaluate an incidence, check for criminal records, and triangulate with other officers wearing glassses-officers to nab suspects. It will create a safer world and also one that's all-intrusive one. Oops, can't type anymore; have a miniature heli hovering outside my window. Hope its miniature camera can't read my keyboard strokes. Don't want to become "person of interest". (:-
I am not sure whether the article get the concept of wearable computing right. Nobody wants to wear a fullblown CPU/GPU/RAM/SSD on to their body. And as Lavender pointed out you need to have reasonably sized display anyhow. In todays context wearable computing refers to miniature devices targeted at a specific niche like health monitoring(nike fuelband) or HCI devices(like google glass) . They are just data collection/recording devices.
Sometimes I think today's advanced devices are contradictory:for the wearable reason,they must be small enough; but for higher experience, the screen must be large. For me, wearable computer will not be appealing to me, for I can not do work with a small-screen wearable computer. Work is also the reason for the existence of traditional PC.