Corporate politics rather than tech advance
I think this is more a corporate turf battle rather than anything that should genuinely excite users technically. I still get some buggy problems with Google Chrome, so they haven't convinced me that they have a IE killer browser yet, let alone a Wndows lkiller. Perhaps its the type of thing I would install as a dual boot since I love Googles willingness to try out new concepts and ideas, so I don't mind giving them space . Windows of course is becoming like alcohol to the alcoholic. We have become so dependent on it it would be impossible and possibly unwise to get rid of it. It is also not as bad as the geek world would make you believe. However,in the eyes of Microsoft , Windows shines on the computer world with the splendor of a great celestial orb floating majestically through cyber space. Of course from the users perspective, we know that the celestial spheres are nothing more than a massive agglomeration of celestial junk randomly crashing onto the planets surface, which has now become beautifully smooth and spherical only because it has collapsed under its own weight.
Google OS is more likely to be like an ugly little asteroid folating around the bigger planet!