If it gets the job done, and creates some value for the user, the user will go over hoops in order to use it (even pay money) ... I find it funny that we are still emulating old terminals. And still building new apps for them. Plain text however gets the job done. It's very powerful to search for a solution on the web, and find instructions on how to do just about anything by copy/pasting a bunch of commands into the terminal. Personally however I prefer GUI's because I can't seem to remember all the commands or keyboard-keybindings unless I use them daily. And if done correctly, a graphics interface can be more intuitive and have better feature discovery compared to a text interface.