Anyway: The problem here is, this beast comes with _another_ totally different look and feel.
What's needed is a consistent look & feel all over all applications, no matter what language they're written in. And the whole thing has to be theme-able, so I can change the look & feel of the whole desktop at the same time.
It's a big strength of Windows and MacOS that every application looks the same (apart from idiots taking pains "their" application looks different. They belong into the user interface hall of shame). But it's a big strength of the X11 toolkits (Gtk, Qt, even Athena) that the look of all the applications written in them is theme-able globally. You don't want to loose that, you want to expand it over different toolkits.