No, seriously, stop. The only people that want or envision a Citrix or a "web" based primary OS are those in the field or an IT department that wants to get paid the same for doing less.
If you want to know what is going to happen if Windows continues to lose market share due to a higher cost, increased unnecessary complexity and lack of understanding about their consumer base you don't need to guess, simply look at what is happening today. Yes, some of the consumers have gone to Linux but quite a few have gone to an Apple based device with Mac OS X.
I believe virtualization technologies are great, use them every day, but they have a place and purpose and replacing the desktop is not one of those. Same as with Google and Chrome, no, Chrome is not an operating system nor does it even come close. It is, an application, a browser, and a very good one at that.
People, corporate or personal, are tired of messing with their computers just to do simple tasks that are now a part of every day life. So few corporations and developers seem to understand that today.