Two schools of thought.
1) Everyday use with regards to ease of use, portability, and delegation to our less experienced members of our staff the GUI is invaluable.
2) Automating and troubleshooting the CLI is invaluable but requires a higher level of understanding.
I look at Microsoft and the fact that they have never removed DOS and have chosen to include another CLI "PowerShell" to there product line. This is more proof of the fact that this type of interface is extremely desired and useful. I can see your point that a majority of normal end users will never move to a CLI proficiency that rivals there GUI experience but it would be extremely limiting to do away with it altogether.