I can't see how we can expand the RISC OS market unfortunately, personally I'm using it less and less, as are others (Pluto/Zap keeps me here) so how can we expect "outsiders" to adopt it?
Windows users won't switch due to the fact that they have more software available than we do, and we no longer have killer apps that don't have Windows equivalents.
Linux users won't switch as it's not open source, and RISC OS is pretty dated in comparison.
Plus there's the considerable expense of buying a RISC OS machine.
Of course, VARiscPC is a way to at least get PC owners to run RISC OS, but ROL or whomever in all their wisdom has stopped that being possible by locking it to the Alpha, that no Win/Lin user would buy....