I think there would be several emulators that would work on MOS through JIT. I am unsure of how many native ones there are. Keep in mind also that MOS can dual boot to Linux and MacOnLinux, which should also have plenty of emulators. However, like you, I would also like to see things like AmiGenerator, TG16, and other emulators ported.

I've got an idea, why don't you list out some of the systems you would like to see emulated, instead of the emulator itself? I'm sure there are people who would look around.