I like the thinking behind this thread, but as a reality it aint gonna happen anytime soon.
Firstly, Nintendo has no interest in supporting a foreign OS that presently accounts for what, <0.1 percent of the OS market? If they did need an OS, Im sure they'd roll their own.
...or just buy the Amiga IP outright, putting an end to all other AmigaOS development. Then you'd get something that felt vuagely like AmigaOS but with Mario as the mouse pointer...
Secondly, Amiga-Inc, et al have no interest in porting to a piece of hardware they receive no revenue from. Even if they were interested, I doubt they'd know how to proceed.
Lastly, the Amiga userbase would throw a fit! (just look at the hostility of this thread) Let alone buy into it. The last thing the dwindling Amiga market needs now is further segmentation.
My advice for people not willing to pay the exorbitant fee for A1/OS4, is to leave the Amiga its fate, and start looking at modern alternatives like, OSX, AROS, Knoppix(Linux) ect.
The truth is, most modern OS's have caught up with, if not far surpassed the AmigaOS experience.