It would be nice if a software emulation of the custom chipset were included in OS4/MOS (leaving 680x0 emulation up to Petunia and Trance respectively), but I don't see it as essential. Hardware level emulation looks extremely impractical outside of projects like minimig.
I don't see it being technically straightforward or financially viable to shove a hardware emulator on a PCI card when it would only really be any use on PPC-only amiga compatibles (given x86 boxes have more than enough grunt to do it all in software nowadays).
