@irishmike:
I don't get it: first you complain that everybody and his dog keeps Unix compatability and basically leave you only the choice of the GUI system used - and one paragaph later you demand that AmigaOS should be turned into a GUI for a Unix system?
As far as I'm concerned, turning AmigaOS into just another Unix GUI would have way more drawbacks than benefits. The GUI never was AmigaOS' strong point anyway, there are only three somewhat remarkable things about its GUI anyway (close button at the top left, screen title bar + menues, depth gadget).
In contrast to that, there are a lot of nice things you'd loose: backwards compatability, a sensible directory structure, extreme responsiveness to name just a few.