In reply to all:
Considering the price for native RISC OS hardware I guess quite a few current users who would love to get more RISC OS performace have a financial problem to get there. And for new users when they look at what they get for how much money I must admit that chances that they do not buy a RISC OS native box is probably not low. I guess that is part of the reason why VirtualRPC did sell so well according to the figures presented on Drobe some time ago.
Adding to this the fact that web browsing with RISC OS is no fun I use Firefox more often than not and usually based on Windows since it is easier when starting in RISC OS due to UniPrint. On the other hand I know that quite a few users do not want Windows. Furthermore despite all the terrific work done for movie playing in RISC OS it seems that currently available processor power is not quite up to it.
Thus I think that a setup offering RISC OS plus the UniPrint features on top of a Linux box (as is currently available for Windows) has a decent chance to get more users to use (or keep using) RISC OS.
Simply put: I love to use RISC OS and do so for quite a few things (especially email, writing letters, drawing) but there are things I prefer to do on Windows or Linux (webbrowsing, cutting movies) - both currently on separate native hardware but for some users running both on one hardware to save space, money, KVM etc. is probably an intersting option.