MOre interesting to me would be running RISC OS on top of a linux/unix kernel on ARM hardware. At least that would avoid the effort of emulating the cpu; I fully understand that that is not a major fraction of the work. It would, just maybe, provide a more reliable kernel upon which to run my favourite RISC OS apps. It would just possibly help with making PMT available along with serious memory protecction.
I understand that some areas of RISC OS are claimed to be not easy to make work in a PMT OS but we've seen that pretty much all apps can be converted from 26 to 32 bit model, something that was pooh-poohed not so long ago. If some changes to cope with PMT were needed I suspect a similar effort would be made by many authors.
While we're at it, how about adopting a more modern FS? Might as well get past all the pain in one go.
Yes, yes, I'm dreaming. So sue me.