I'm working on a new project to build some simple workflow applications for business, and one of the aspects I would like to attempt to resolve is the speed of input. It is painful watching operators work with modern GUI inputs, particularly web based as the mouse work slows them down horrendously. And keyboard 'shortcuts' where they exist are often anything but, as the entire GUI model assumes a mouse (or on the web a Document) first.
It is like you mention about this CSS library, it kind of misses the point in that the awesomeness of TUI is not in the appearance, but rather how workflows that the constraints of a keyboard-first interface enforce allow creative and highly efficient solutions.
When all you have is a mouse everything becomes a click, and that is a horrible way to input data.