Bob has a point surely? You guys surely are interested in the operating system up (or at least the majority of users are). Given that you can apparently emulate RISC OS at reasonable speedson ix86, why not switch over?
When Apple moved over to PowerPC, one of the reasons they got away with it was that they could emulate 68k on the PowerPC at speeds comparable to running it natively. This was quite important as lots of the OS was in 68k asm, and that was run in the same emulation environment. And all this was before fun things like JITs were the norm.
So, you move RISC OS to ix86, emulate what needs to be, recompile where at all possible, and move developers over to ix86 tool chains. RISC OS hardware companies can specialise in building PCs that have appropriate driver support.
What's more, users could dual boot to get Windows if need be.
Unlikely to happen I'd say, but not infeasible technically.