Personally I think the initial development focus should be on OS features rather than ports to other architectures. After all, if RISC OS has enough selling points, then people won't move to another OS which runs on their machine, even under emulation. If we then abandon ARM altogether, the bread and butter income of STB development is gone, while the trickle-down of those developments to desktop users is lost.
Do you still have that XScaled Omega, and is it actually as functional as an Iyonix? I'd hate to think it was a garden ornament in DA's community project