What about the enterprise and the decently sized small to large sized businesses that don't purchase or get serviced at the brick and mortar retail level? I don't think that MS would continue extending the period for XP to be installed/sold if it were such a small issue.

I do know a number of devoutly religious people that use linux, just as I know a number of agnostics and atheists that use windows or osx, purely for preference. If anything, perhaps there may be something more basic at play, such as people that don't think outside of the box and those that continue to use Windows.

I believe it's the longest run between releases for inkscape, but it was definitely worth the wait!