With the current lack of manpower, formally forking AROS will just create 2 stagnant projects. Besides, AfAOS sort of accomplishes what your proposed Classic fork would do anyway.
I don't follow AROS very closely, so I don't know if there are any roadblocks to memory protection. The problem with implementing it on the other Amiga OSes has always been that everything would break. Given that there probably isn't any useful AROS software whose source code has been lost, I say, break it, then fix. Finish up that UAE integration to open up the Amiga's back catalogue, and there you go: a usable Amiga operating system on standard hardware.
