Currently my observation is that many users don't feel comfortable with TC because its default configuration is awful and it looks ugly.
This is exactly my experience. I get really excited and promote TC to everyone who will listen. Those that actually understand what file management is about will at least try TC, but only the real power users can see past the lack of visual appeal and lack of GUI niceties to the real power hidden inside it. The rest say "that's nice" and go back to Explorer.
Mr. Ghisler may have enough to do already, and may not need the extra business either, so enhancements that make TC more "appealing" to the general public may not be forthcoming.
I have used TC for many years and love it to death. BUT I am also totally sold on the point-and-click + GUI metaphor for computer interaction and rarely use the keyboard, so GUI enhancements to TC are high on my list. That they would make TC more appealing to the general public would just be a bonus.
Some research suggests that a properly designed GUI interface to any computer activity is more efficient for the user than a commandline/keyboard interface. However, the key words are "properly designed". Ain't seen a GUI yet that beats a really good typist with a good knowledge of a powerful command language. Maybe some day.
It sure would be a pain to drive a car via a commandline and a keyboard, though, wouldn't it? That's what steering wheels are for!