
It is not fashionable nowadays to speak of the merits of the command line, in an age where things like streaming video and Aqua are an integral part of our daily life. However, I do not think that typed-in commands must necessarily be consigned to the dustbin of computer history. Of course, I am not suggesting that we all drop X and Windows and pretend like we are living in the early eighties. The command line interface still has much to offer us, and many of its benefits simply cannot physically be emulated or even replaced by graphical ones.
As a poster before me said: why not combine them?
Let's analyze that CLI means command line interface, GUI means graphical user interface, what about a command driven graphical user interface (AFAIK THE is somethimg like that)?
At least the biggest disadvantages of both GUIs (flexibility, reusability) and CLIs(memorization, data representation) is by design, not per se.