There really needs to be a sticky thread somewhere explaining to people why a UI update won't happen for a good time.
The UI is functional. It works. It might be butt-ugly and a bit convoluted but it does its job. If you've played DF as much as you say you have then surely you've grown past worrying about the UI. I (and most other players) would much prefer new game features than reworking of things that already work exactly as intended and really wouldn't contribute to expanding the game in ay way.
Also, money ≠ work on UI. I'm not sure how you came up with that idea, but it's not a good one. You'd be better off camping outside his home with a protest sign.
The UI is hardly "functional"... I mean lets not kid ourselves here, there were things you had to look up how to do because there was no way to find out looking at the UI.
As for most other players... Well, I am going to have to test this.
"functional |ˈfʌŋ(k)ʃ(ə)n(ə)l|
adjective
1 of or having a special activity, purpose, or task; relating to the way in which something works or operates : there are important functional differences between left and right brain.
• designed to be practical and useful, rather than attractive : she had assumed the apartment would be functional and simple."
I dunno, I'd say that fits pretty well. It's functional, it's just not accessible and even then it's not that great a stretch to be able to learn how it functions to the point that you can memorise which command corresponds to the most used and important commands.