I read the BBC article. I agree with pretty much everything that Lyn and nightflier wrote (read both posts a few times, couldn't find anything I disagreed with, thus the "pretty much").
Yeah, incremental changes are the thing right now (along with bug fixes, and increased security). If Windows 7 is going to go in that direction, I think it's a good idea. At some point computer technology will develop in some new direction that will require a re-thinking of interface design, but we're not there yet. As things are, the WIMP interface is pretty good for most people, and so incremental refinements in that are the way to go.
As far as Linux goes ... well, in my experience Linux users are different from most other computer users in some significant ways. Generally they tend to be people who like to tinker with their machines (either hardware or software, or both). They also like to try out new things, even if generally they don't often find something new that they like enough to use regularly. So I would say generally that more frequent releases (kernel, gui, applications, distro, etc.) is something that the average Linux user is more comfortable with than Windows or OS X users would be. Also, it doesn't hurt that you don't have to shell out a bunch of money just to get the new version of something.