Yes, Mozilla Ubiquity (http://labs.mozilla.com/projects/ubiquity/) is also another effort to bring a command line-like interface to the web browser.
Efforts like this to bring a command line-like UI to places outside of the terminal can make the argument that the command line is dying somewhat silly. That said, I believe that the pro-Linux-desktop people are correct in saying that while the command line can help get things done, it does not have to be used frequently by non-technical individuals.
The command line will not die. It will grow in places that were not previously expected. For example, take voice-activated technology. That is basically a command line with simple, spoken commands.
(Apologies for slightly rambling in my comment. I have a lot of thoughts stirring around in my head.)