AMS: "Thing is that there are faster ARM's on the way [...]"
But who's going to design and build the hardware to house such an ARM for a desktop computer likely to sell in the hundreds? No-one can *seriously* argue, surely, that hardware is what sets a RISC OS computer apart? Yes, they can be quiet and small because of the hardware; but so's a Mac Mini and that's got a dual core x86 chip in it.
If it's the software - whether applications or GUI - let's find a way of getting that to run on commodity hardware, so developers/users/interested parties have a) a lower barrier to entry to the platform; and b) can invest in furthering the software, not designing new low-end (in the real world) computers to run them on.
The fact that commodity hardware, being so much faster in terms of raw grunt, will also open up the possibility of doing all those things which no RISC OS computer can feasibly do - DVD ripping/playback; video editing; massive compiles etc. - is another reason it should appeal.