http://wiibrew.org/wiki/IOS
And at which point does that autotranslate to AmigaDOS compatible filesystems, a graphics subsystem that take calls designed graphics or cybergraphics.library?
Is there an USB stack and does it translate KBD and mouse to something input.device/intuition could understand?
Nah, all it does is what other HW provide with OpenFirmware,UBoot,EFI,etc etc
And you still haven answered why it would be such a good idea if the HW offers no real advantage over already supported and easily available G4 MacMini.