I think I can remember Geit estimating it would need 5 years to port MOS to another platform (X86 or ARM) and that would be 5 years without any updates because all would be busy with the migration. So obviously MOS was never designed to be (easy) portable like f.e. Aros. My final conclusion is MOS will (propably) never be ported to a different architecture because of lack of resources. For people that can live with PPC it is a good choice, when you want something to run on modern new standard hardware you only have the option to use Aros.