I don't think Glass (or a similar product) will ever be used for intensive tasks, but I think you're underestimating what you can do with gps, wifi, gyroscopes, accelerometers, 2D touch surface and voice.
Writing instant messages? I already find the voice transcription on Jellybean to be faster and easier than a touchpad. Checking when the trains go? Ideally, Glass tells you before you even need it (a la Google Now), but that can also be a voice query. Browsing the web? I don't think that's the intended use case, but touchpad + detecting head position / movement for navigation should make this pretty easy.
I won't code on Glass, but I look forward to never fumbling to get my phone out of my pocket, turning it on, and launching the camera app. That and simple information retrieval queries "Glass, define 'dionysian'"; "Glass, when will Jenny's flight get in?"; "Glass, what's the surface area of the Sun?" will by themselves make glass worthwhile for me.
Writing instant messages? I already find the voice transcription on Jellybean to be faster and easier than a touchpad. Checking when the trains go? Ideally, Glass tells you before you even need it (a la Google Now), but that can also be a voice query. Browsing the web? I don't think that's the intended use case, but touchpad + detecting head position / movement for navigation should make this pretty easy.
I won't code on Glass, but I look forward to never fumbling to get my phone out of my pocket, turning it on, and launching the camera app. That and simple information retrieval queries "Glass, define 'dionysian'"; "Glass, when will Jenny's flight get in?"; "Glass, what's the surface area of the Sun?" will by themselves make glass worthwhile for me.