well, personally, it would be nice to see homeworld on AOS, and perhaps AROS, but the thing is, couldnt the people who bought it to MOS, just recompile it for the other two platforms?
No, because developer who ported it to MorphOS doesn't have access to OS4 and anyway, it's also questionable if MiniGL implements enough of OpenGL to run homeworld (so it would be better if it was done by someone who also develops MiniGL).
As for AROS, there's no accelerated GL implementation at all, so it's kinda pointless to port it there.