Personally I hate UI changes and I want Audacity to change as little as possible in that regard. It is not a tool that I use regularly so I want to be able to not use it for a year or two, get back to it and still find the same familiar interface.
That is not to say that there are not many sensible changes that could be and maybe should be made to Audacity. I am just saying that stability is far more valuable for me. I rather wish for more stability in software than better UI.