I think ARM is the best future route fo MorphOS. A €35 light/stripped MOS version ported for RPi would be a perfect match to raise awareness until Cortex 64 bit A57 is brought to market. RPi have many benefits to piggy back on that attracts interest:

1 it is REALLY small - yet a real computer
2. It is unique new appoach
3. It has 512 mb mem and cpu can be overclocked up to 1000MGz
4. It is fun
5. It can be used as mediaplayer.
6. It needs a good and light OS when you like to surf, play simple games etc
7. It is selling big volumes so many can come in contact with MorphOS, preparing them for more powerful hardware on cortex A57 in 1-2 years