To be honest google was not the first, "augmented reality" has been something that has been around for a very long time now. It just was not an affordable thing to have. For example the Nintendo DS supports augmented reality, http://www.youtube.com/watch?v...<-- Nintendo DS Demo
All these companies have done is shove the camera in the glasses, and using reflective services to project the images in front of you. I do like how google has taken a step further than most, and use a "bone vibration" instead of a speaker. Something that has also been around for a long time. Instead of a speaker, they pump the vibrations of the noises directly onto your bone that connects to your ear drum. This provides "true" privacy in the phone call where people can't listen in beside you.
As far as all of this stuff goes, it is just becoming popular. It is technology that has been around for years, just taking off. It is kinda like opensim, we have had a small take off points, and we may have another big one at some point. Which will expand the development even further. But this is technology we all had already, just more compact, and more affordable.
As far as computer becoming obsolete, I think maybe for end users, but for people like me and others who are developers. We will always be tied down to our devices, something that we can't really help. Code is written, line by line, and we need the power of PC's to compile these operations. Though we do have the cloud to compute and compile these days, but it is really not as affordable as people make it seem.
However, this did feature one things Google had to REMOVE from their glasses due to the major protests against Google Glass. People have asked before Google adds back facial recolonization they MUST include a DO NOT TRACK feature that keeps a record of people it WILL NOT identify and MUST ignore. This is a hard thing to do, but is a valid concern. Me, I am not that worried about myself, but I know plenty of very valid and legit reasons to not include. Wives fleeing abusive husbands, who they have divorced, children who have not reached an age to choose weather or not to have their data tracked. These are things people MUST keep in mind when making things like this.